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Bhalavi RK, Béjot P, Leblanc A, Dubrouil A, Billard F, Faucher O, Hertz E. Phase-matching-free ultrashort laser pulse characterization from a transient plasma lens. Opt Lett 2024; 49:1321-1324. [PMID: 38427003 DOI: 10.1364/ol.516584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 02/05/2024] [Indexed: 03/02/2024]
Abstract
A phase-matching-free ultrashort pulse retrieval based on the defocusing of a laser-induced plasma is presented. In this technique, a pump pulse ionizes a rare gas providing a plasma lens whose creation time is ultrafast. A probe pulse propagating through this gas lens experiences a switch of its divergence. The spectrum of the diverging part, isolated by a coronograph, is measured as a function of the pump-probe delay, providing a spectrogram that allows for a comprehensive characterization of the temporal properties of the probe pulse. The method, called PI-FROSt for "plasma-induced frequency-resolved optical switching," is simple, is free of phase-matching constraints, and can operate in both self- and cross-referenced configurations at ultrahigh repetition rate in the whole transparency range of the gas. The assessment of the method demonstrates laser pulse reconstructions of high reliability in both near-infrared (NIR) and ultraviolet (UV) spectral ranges.
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Bournazel M, Ma J, Billard F, Hertz E, Wu J, Boulet C, Faucher O, Hartmann JM. Quantum modeling, beyond secularity, of the collisional dissipation of molecular alignment using the energy-corrected sudden approximation. J Chem Phys 2023; 158:2887565. [PMID: 37125716 DOI: 10.1063/5.0150002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 04/12/2023] [Indexed: 05/02/2023] Open
Abstract
We propose a Markovian quantum model for the time dependence of the pressure-induced decoherence of rotational wave packets of gas-phase molecules beyond the secular approximation. It is based on a collisional relaxation matrix constructed using the energy-corrected sudden approximation, which improves the previously proposed infinite order sudden one by taking the molecule rotation during collisions into account. The model is tested by comparisons with time-domain measurements of the pressure-induced decays of molecular-axis alignment features (revivals and echoes) for HCl and CO2 gases, pure and diluted in He. For the Markovian systems HCl-He and CO2-He, the comparisons between computed and measured data demonstrate the robustness of our approach, even when the secular approximation largely breaks down. In contrast, significant differences are obtained in the cases of pure HCl and CO2, for which the model underestimates the decay rate of the alignment at short times. This result is attributed to the non-Markovianity of HCl-HCl and CO2-CO2 interactions and the important contribution of those collisions that are ongoing at the time when the system is excited by the aligning laser pulse.
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Affiliation(s)
- M Bournazel
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - J Ma
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - F Billard
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - E Hertz
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - J Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - C Boulet
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Saclay, Orsay F-91405, France
| | - O Faucher
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - J-M Hartmann
- Laboratoire de Météorologie Dynamique/IPSL, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Sorbonne Université, Ecole Normale Supérieure, Université PSL, F-91120 Palaiseau, France
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Béjot P, Szmygel E, Dubrouil A, Billard F, Lavorel B, Faucher O, Hertz E. Doppler effect as a tool for ultrashort electric field reconstruction. Opt Lett 2020; 45:6795-6798. [PMID: 33325899 DOI: 10.1364/ol.402935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
We present a new, to the best of our knowledge, variant of the spectral-shearing interferometry method for characterizing ultrashort laser pulses. This original approach, called Doppler effect e-field replication (DEER), exploits the rotational Doppler effect for producing frequency shear and provides spectral shearing in the absence of frequency conversion, enabling operation in the ultraviolet spectral range. Evaluation of the DEER-spectral phase interferometry for direct electric field reconstruction setup reveals a phase reconstruction of great reliability. Possible improvements, benefits, and worthwhile prospects of the method are discussed.
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Billard F, Dubrouil A, Hertz E, Lecorné S, Szmygel E, Faucher O, Béjot P. BOAR: Biprism based optical autocorrelation with retrieval. Rev Sci Instrum 2019; 90:063110. [PMID: 31255003 DOI: 10.1063/1.5054357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 06/03/2019] [Indexed: 06/09/2023]
Abstract
A simple and compact single-shot autocorrelator is presented and analyzed in detail. The autocorrelator is composed of two elements only: a Fresnel biprism used to create two temporally delayed replicas of the pulse to characterize and a camera in which two-photon absorption takes place. The two-photon absorption signal obtained in the camera can be used to retrieve the pulse duration, the frequency chirp, and the pulse spectrum, provided that a Gaussian temporal shape is assumed. Thanks to its extreme simplicity, the autocorrelator is robust and easy to align. The presented design can theoretically characterize the pulse duration from about 25 fs to 1.5 ps in the two-photon spectral range of the camera (1200-2400 nm). Finally, a proof-of-principle demonstration is also performed at 3.1 μm by using an InGaAs camera, whose two-photon spectral range is located further in the infrared (1800-3400 nm).
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Affiliation(s)
- F Billard
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté, 9 Ave. A. Savary, BP 47870, F-21078 Dijon Cedex, France
| | - A Dubrouil
- Femto Easy, Bâtiment Sonora, Parc Scientifique et Technologique Laseris 1, Avenue du Medoc, 33114 Le Barp, France
| | - E Hertz
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté, 9 Ave. A. Savary, BP 47870, F-21078 Dijon Cedex, France
| | - S Lecorné
- Femto Easy, Bâtiment Sonora, Parc Scientifique et Technologique Laseris 1, Avenue du Medoc, 33114 Le Barp, France
| | - E Szmygel
- Femto Easy, Bâtiment Sonora, Parc Scientifique et Technologique Laseris 1, Avenue du Medoc, 33114 Le Barp, France
| | - O Faucher
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté, 9 Ave. A. Savary, BP 47870, F-21078 Dijon Cedex, France
| | - P Béjot
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté, 9 Ave. A. Savary, BP 47870, F-21078 Dijon Cedex, France
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Zhang H, Lavorel B, Billard F, Hartmann JM, Hertz E, Faucher O, Ma J, Wu J, Gershnabel E, Prior Y, Averbukh IS. Rotational Echoes as a Tool for Investigating Ultrafast Collisional Dynamics of Molecules. Phys Rev Lett 2019; 122:193401. [PMID: 31144959 DOI: 10.1103/physrevlett.122.193401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Indexed: 06/09/2023]
Abstract
We show that recently discovered rotational echoes of molecules provide an efficient tool for studying collisional molecular dynamics in high-pressure gases. Our study demonstrates that rotational echoes enable the observation of extremely fast collisional dissipation, at timescales of the order of a few picoseconds, and possibly shorter. The decay of the rotational alignment echoes in CO_{2} gas and CO_{2}-He mixture up to 50 bar was studied experimentally, delivering collision rates that are in good agreement with the theoretical expectations. The suggested measurement protocol may be used in other high-density media, and potentially in liquids.
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Affiliation(s)
- H Zhang
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne Franche-Comté, BP 47870, 21078 Dijon, France
| | - B Lavorel
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne Franche-Comté, BP 47870, 21078 Dijon, France
| | - F Billard
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne Franche-Comté, BP 47870, 21078 Dijon, France
| | - J-M Hartmann
- Laboratoire de Météorologie Dynamique/IPSL, CNRS, École polytechnique, Sorbonne Université, École Normale Supérieure, PSL Research University, F-91120 Palaiseau, France
| | - E Hertz
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne Franche-Comté, BP 47870, 21078 Dijon, France
| | - O Faucher
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne Franche-Comté, BP 47870, 21078 Dijon, France
| | - Junyang Ma
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jian Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Erez Gershnabel
- AMOS and Department of Chemical and Biological Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yehiam Prior
- AMOS and Department of Chemical and Biological Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ilya Sh Averbukh
- AMOS and Department of Chemical and Biological Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Hartmann JM, Boulet C, Zhang H, Billard F, Faucher O, Lavorel B. Collisional dissipation of the laser-induced alignment of ethane gas: Energy corrected sudden quantum model. J Chem Phys 2018; 149:214305. [PMID: 30525727 DOI: 10.1063/1.5053963] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
We present the first quantum mechanical model of the collisional dissipation of the alignment of a gas of symmetric-top molecules (ethane) impulsively induced by a linearly polarized non-resonant laser field. The approach is based on use of the Bloch model and of the Markov and secular approximations in which the effects of collisions are taken into account through the state-to-state rates associated with exchanges among the various rotational states. These rates are constructed using the Energy Corrected Sudden (ECS) approximation with (a few) input parameters obtained independently from fits of the pressure-broadening coefficients of ethane absorption lines. Based on knowledge of the laser pulse characteristics and on these rates, the time-dependent equation driving the evolution of the density matrix during and after the laser pulse is solved and the time dependence of the so-called "alignment factor" is computed. Comparisons with measurements, free of any adjusted parameter, show that the proposed approach leads to good agreement with measurements. The analysis of the ECS state-to-state collisional rates demonstrates that, as in the case of linear molecules, collision-induced changes of the rotational angular momentum orientation are slower than those of its magnitude. This explains why the collisional decay of the permanent component of the alignment is significantly slower than that of the amplitudes of the transient revivals in both experimental and computed results. It is also shown that, since intermolecular forces within C2H6 colliding pairs weakly depend on rotations of the molecules around their C-C bond, the dissipation mechanism of the alignment in pure ethane is close to that involved in linear molecules.
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Affiliation(s)
- J-M Hartmann
- Laboratoire de Météorologie Dynamique/IPSL, CNRS, École polytechnique, Sorbonne Université, École Normale Supérieure, PSL Research University, F-91120 Palaiseau, France
| | - C Boulet
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Sud, Université Paris-Saclay, Orsay F-91405, France
| | - H Zhang
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - F Billard
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - O Faucher
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - B Lavorel
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
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Hartmann JM, Boulet C, Zhang H, Billard F, Faucher O, Lavorel B. Collisional dissipation of the laser-induced alignment of ethane gas: A requantized classical model. J Chem Phys 2018; 149:154301. [PMID: 30342447 DOI: 10.1063/1.5046899] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present the first theoretical study of collisional dissipation of the alignment of a symmetric-top molecule (ethane gas) impulsively induced by a linearly polarized non-resonant laser field. For this, Classical Molecular Dynamics Simulations (CMDSs) are carried out for an ensemble of C2H6 molecules based on knowledge of the laser-pulse characteristics and on an input intermolecular potential. These provide, for a given gas pressure and initial temperature, the orientations of all molecules at all times from which the alignment factor is directly obtained. Comparisons with measurements show that these CMDSs well predict the permanent alignment induced by the laser pulse and its decay with time but, as expected, fail in generating alignment revivals. However, it is shown that introducing a simple requantization procedure in the CMDS "creates" these revivals and that their predicted dissipation decay agrees very well with measured values. The calculations also confirm that, as for linear molecules, the permanent alignment of ethane decays more slowly than the transient revivals. The influence of the intermolecular potential is studied as well as that of the degree of freedom associated with the molecular rotation around the symmetry axis. This reveals that ethane practically behaves as a linear molecule because the intermolecular potential is only weakly sensitive to rotation around the C-C axis.
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Affiliation(s)
- J-M Hartmann
- Laboratoire de Météorologie Dynamique/IPSL, CNRS, École polytechnique, Sorbonne Université, École Normale Supérieure, PSL Research University, F-91120 Palaiseau, France
| | - C Boulet
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Sud, Université Paris-Saclay, Orsay F-91405, France
| | - H Zhang
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - F Billard
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - O Faucher
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - B Lavorel
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
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Zhang H, Billard F, Yu X, Faucher O, Lavorel B. Dissipation dynamics of field-free molecular alignment for symmetric-top molecules: Ethane (C2H6). J Chem Phys 2018; 148:124303. [DOI: 10.1063/1.5019356] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- H. Zhang
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - F. Billard
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - X. Yu
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - O. Faucher
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
| | - B. Lavorel
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université, Bourgogne-Franche Comté, 9 Ave. A. Savary, BP 47 870, F-21078 Dijon Cedex, France
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Pradat P, Pugliese P, Poizot-Martin I, Valantin MA, Cuzin L, Reynes J, Billaud E, Huleux T, Bani-Sadr F, Rey D, Frésard A, Jacomet C, Duvivier C, Cheret A, Hustache-Mathieu L, Hoen B, Cabié A, Cotte L, Chidiac C, Ferry T, Ader F, Biron F, Boibieux A, Miailhes P, Perpoint T, Schlienger I, Lippmann J, Braun E, Koffi J, Longuet C, Guéripel V, Augustin-Normand C, Brochier C, Degroodt S, Pugliese P, Ceppi C, Cua E, Cottalorda J, Courjon J, Dellamonica P, Demonchy E, De Monte A, Durant J, Etienne C, Ferrando S, Fuzibet J, Garraffo R, Joulie A, Risso K, Mondain V, Naqvi A, Oran N, Perbost I, Pillet S, Prouvost-Keller B, Wehrlen-Pugliese S, Rosenthal E, Sausse S, Rio V, Roger P, Brégigeon S, Faucher O, Obry-Roguet V, Orticoni M, Soavi M, Geneau de Lamarlière P, Laroche H, Ressiot E, Carta M, Ducassou M, Jacquet I, Gallie S, Galinier A, Ritleng A, Ivanova A, Blanco-Betancourt C, Lions C, Debreux C, Obry-Roguet V, Poizot-Martin I, Agher R, Katlama C, Valantin M, Duvivier C, Lortholary O, Lanternier F, Charlier C, Rouzaud C, Aguilar C, Henry B, Lebeaux D, Cessot G, Gergely A, Consigny P, Touam F, Louisin C, Alvarez M, Biezunski N, Cuzin L, Debard A, Delobel P, Delpierre C, Fourcade C, Marchou B, Martin-Blondel G, Porte M, Mularczyk M, Garipuy D, Saune K, Lepain I, Marcel M, Puntis E, Atoui N, Casanova M, Faucherre V, Jacquet J, Le Moing V, Makinson A, Merle De Boever C, Montoya-Ferrer A, Psomas C, Reynes J, Raffi F, Allavena C, Billaud E, Biron C, Bonnet B, Bouchez S, Boutoille D, Brunet C, Jovelin T, Hall N, Bernaud C, Morineau P, Reliquet V, Aubry O, Point P, Besnier M, Larmet L, Hüe H, Pineau S, André-Garnier E, Rodallec A, Choisy P, Vandame S, Huleux T, Ajana F, Alcaraz I, Baclet V, Huleux T, Melliez H, Viget N, Valette M, Aissi E, Allienne C, Meybeck A, Riff B, Bani-Sadr F, Rouger C, Berger J, N'Guyen Y, Lambert D, Kmiec I, Hentzien M, Lebrun D, Migault C, Rey D, Batard M, Bernard-Henry C, Cheneau C, de Mautort E, Fischer P, Partisani M, Priester M, Lucht F, Frésard A, Botelho-Nevers E, Gagneux-Brunon A, Cazorla C, Guglielminotti C, Daoud F, Lutz M, Jacomet C, Laurichesse H, Lesens O, Vidal M, Mrozek N, Corbin V, Aumeran C, Baud O, Casanova S, Coban D, Hustache-Mathieu L, Thiebaut-Drobacheff M, Foltzer A, Gendrin V, Bozon F, Chirouze C, Abel S, Cabié A, Césaire R, Santos GD, Fagour L, Najioullah F, Ouka M, Pierre-François S, Pircher M, Rozé B, Hoen B, Ouissa R, Lamaury I. Direct-acting antiviral treatment against hepatitis C virus infection in HIV-Infected patients - "En route for eradication"? J Infect 2017; 75:234-241. [PMID: 28579302 DOI: 10.1016/j.jinf.2017.05.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 03/17/2017] [Accepted: 05/11/2017] [Indexed: 02/07/2023]
Abstract
OBJECTIVES Direct-Acting Antivirals (DAAs) opened a new era in HCV treatment. We report the impact of HCV treatment in French HIV-HCV coinfected patients. METHODS All HIV-HCV patients from the Dat'AIDS cohort followed between 2012 and 2015 were included. HCV status was defined yearly as naive, spontaneous cure, sustained virological response (SVR12), failure or reinfection. RESULTS Among 32,945 HIV-infected patients, 15.2% were positive for anti-HCV antibodies. From 2012 to 2015, HCV incidence rate increased from 0.35%PY to 0.69%PY in MSM, while median incidence was 0.08%PY in other patients. Median reinfection rate was 2.56%PY in MSM and 0.22%PY in other patients. HCV treatment initiation rate rose from 8.2% in 2012 to 29.6% (48.0% in pre-treated patients vs 22.6% in naïve patients). SVR12 rate increased from 68.7% to 95.2%. By the end of 2015, 62.7% of the patients were cured either spontaneously or following SVR. CONCLUSIONS HCV treatment dramatically increased in HIV-HCV patients in France from 2012 to 2015 resulting in HCV cure in nearly two-thirds of the patients in this cohort. Combined with a declining HCV prevalence, the prevalence of active HCV infection among HIV patients will drastically decrease in the forthcoming years.
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Affiliation(s)
- Pierre Pradat
- Center for Clinical Research, Department of Hepatology, Croix-Rousse Hospital, Hospices Civils de Lyon, Lyon, France.
| | - Pascal Pugliese
- Department of Infectious Diseases, Centre Hospitalier Universitaire de Nice, Hôpital l'Archet, Nice, France
| | - Isabelle Poizot-Martin
- Immuno-hematology Clinic, Assistance Publique - Hôpitaux de Marseille, Hôpital Sainte-Marguerite, Marseille, France; Aix-Marseille University, Inserm U912 (SESSTIM), Marseille, France
| | - Marc-Antoine Valantin
- Department of Infectious Diseases, Assistance Publique - Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Sorbonne Universités, UPMC Université Paris 06, INSERM, Institut Pierre Louis d'épidémiologie et de Santé Publique (IPLESP UMRS 1136), Paris, France
| | - Lise Cuzin
- CHU Toulouse, COREVIH, Toulouse, France; Université de Toulouse III, Toulouse, France; INSERM, UMR, 1027, Toulouse, France
| | - Jacques Reynes
- Department of Infectious Diseases, UMI 233 INSERM U1175, CHU de Montpellier, Montpellier, France
| | - Eric Billaud
- Department of Infectious Diseases, Hotel Dieu Hospital, Nantes, France
| | - Thomas Huleux
- Department of Infectious Diseases and Travel Diseases, Centre Hospitalier Gustave-Dron, Tourcoing, France
| | - Firouze Bani-Sadr
- Department of Internal Medicine, Infectious Diseases and Clinical Immunology, Hôpital Robert Debré, CHU, Reims, France; Université de Reims Champagne-Ardenne, Faculté de médecine, EA-4684/SFR CAP-SANTE, Reims, France
| | - David Rey
- HIV Infection Care Centre, Hôpitaux Universitaires, Strasbourg, France
| | - Anne Frésard
- Department of Infectious Diseases, CHU, Saint-Etienne, France
| | - Christine Jacomet
- Department of Infectious Diseases, CHU Clermont-Ferrand, Clermont-Ferrand, France
| | - Claudine Duvivier
- Department of Infectious Diseases, Centre d'Infectiologie Necker-Pasteur, IHU Imagine, Assistance Publique - Hôpitaux de Paris, Hôpital Necker-Enfants Malades, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, EA7327, Paris, France
| | - Antoine Cheret
- Department of Internal Medicine, CHU, Bicètre, France; Université Paris Descartes, Sorbonne Paris Cité, EA7327, Paris, France
| | | | - Bruno Hoen
- Faculté de Médecine Hyacinthe Bastaraud, Université des Antilles, and Service de Maladies Infectieuses et Tropicales, Dermatologie et Médecine Interne, and Inserm CIC 1424, Centre Hospitalier Universitaire de Pointe-à-Pitre, Pointe-à-Pitre, France
| | - André Cabié
- Department of Infectious Diseases, CHU de Martinique, Fort-de-France, France; Université des Antilles EA4537 and INSERM CIC1424, Fort-de-France, France
| | - Laurent Cotte
- Department of Infectious Diseases, Croix-Rousse Hospital, Hospices Civils de Lyon, Lyon, France; INSERM U1052, Lyon, France.
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Skantzakis E, Chatziathanasiou S, Carpeggiani PA, Sansone G, Nayak A, Gray D, Tzallas P, Charalambidis D, Hertz E, Faucher O. Polarization shaping of high-order harmonics in laser-aligned molecules. Sci Rep 2016; 6:39295. [PMID: 27995974 PMCID: PMC5172357 DOI: 10.1038/srep39295] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 11/21/2016] [Indexed: 11/17/2022] Open
Abstract
The present work reports on the generation of short-pulse coherent extreme ultraviolet radiation of controlled polarization. The proposed strategy is based on high-order harmonics generated in pre-aligned molecules. Field-free molecular alignment produced by a short linearly-polarized infrared laser pulse is used to break the isotropy of a gas medium. Driving the aligned molecules by a circularly-polarized infrared pulse allows to transfer the anisotropy of the medium to the polarization of the generated harmonic light. The ellipticity of the latter is controlled by adjusting the angular distribution of the molecules at the time they interact with the driving pulse. Extreme ultraviolet radiation produced with high degree of ellipticity (close to circular) is demonstrated.
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Affiliation(s)
- E Skantzakis
- Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, GR-711 10 Heraklion, Crete, Greece
| | - S Chatziathanasiou
- Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, GR-711 10 Heraklion, Crete, Greece
- Department of Physics, University of Crete, P.O. Box 2208, GR71003 Heraklion, Crete, Greece
| | - P A Carpeggiani
- Dipartimento di Fisica Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
| | - G Sansone
- ELI-ALPS, ELI-Hu Kft., Dugonics tér 13, H-6720 Szeged Hungary
- Institute of Photonics and Nanotechnologies (IFN)-Consiglio Nazionale delle Ricerche (CNR), Piazza Leonardo da Vinci 32, 20133 Milano, Italy
- Dipartimento di Fisica Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
| | - A Nayak
- ELI-ALPS, ELI-Hu Kft., Dugonics tér 13, H-6720 Szeged Hungary
| | - D Gray
- Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, GR-711 10 Heraklion, Crete, Greece
| | - P Tzallas
- Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, GR-711 10 Heraklion, Crete, Greece
- ELI-ALPS, ELI-Hu Kft., Dugonics tér 13, H-6720 Szeged Hungary
| | - D Charalambidis
- Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, GR-711 10 Heraklion, Crete, Greece
- Department of Physics, University of Crete, P.O. Box 2208, GR71003 Heraklion, Crete, Greece
- ELI-ALPS, ELI-Hu Kft., Dugonics tér 13, H-6720 Szeged Hungary
| | - E Hertz
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté, 9 Av. A. Savary, BP 47870, F-21078 DIJON Cedex, France
| | - O Faucher
- ELI-ALPS, ELI-Hu Kft., Dugonics tér 13, H-6720 Szeged Hungary
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté, 9 Av. A. Savary, BP 47870, F-21078 DIJON Cedex, France
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11
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Hertz E, Billard F, Karras G, Béjot P, Lavorel B, Faucher O. Shaping of ultraviolet femtosecond laser pulses by Fourier domain harmonic generation. Opt Express 2016; 24:27702-27714. [PMID: 27906339 DOI: 10.1364/oe.24.027702] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a method to finely tailor ultraviolet femtosecond laser pulses using a pulse shaper with ability in the infrared/visible spectral range. We have developed to that end a frequency doubling module in which the up-conversion mechanism is carried out in the Fourier plane of a 4 f -line. The pulse shaper is used to imprint a spectral phase and/or amplitude onto the fundamental pulse. The shaped pulse is then frequency doubled through the module which transfers the applied spectral shaping to the second harmonic field in a predictable manner. The relevance of the method is demonstrated by synthesizing and characterizing shaped pulses at a central wavelength of 400 nm. The results demonstrate a full control over the spectral phase and amplitude of the harmonic field. The experimental setup is simple and features interesting prospects for the polarization shaping of ultraviolet pulses and the production of shaped ultraviolet pulses requested for the seeding of free-electron lasers.
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Karras G, Hertz E, Billard F, Lavorel B, Hartmann JM, Faucher O, Gershnabel E, Prior Y, Averbukh IS. Orientation and alignment echoes. Phys Rev Lett 2015; 114:153601. [PMID: 25933313 DOI: 10.1103/physrevlett.114.153601] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Indexed: 06/04/2023]
Abstract
We present one of the simplest classical systems featuring the echo phenomenon-a collection of randomly oriented free rotors with dispersed rotational velocities. Following excitation by a pair of time-delayed impulsive kicks, the mean orientation or alignment of the ensemble exhibits multiple echoes and fractional echoes. We elucidate the mechanism of the echo formation by the kick-induced filamentation of phase space, and provide the first experimental demonstration of classical alignment echoes in a thermal gas of CO_{2} molecules excited by a pair of femtosecond laser pulses.
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Affiliation(s)
- G Karras
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - E Hertz
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - F Billard
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - B Lavorel
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - J-M Hartmann
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA) CNRS (UMR 7583), Université Paris Est Créteil, Université Paris Diderot, Institut Pierre-Simon Laplace, Université Paris Est Créteil, 94010 Créteil Cedex, France
| | - O Faucher
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - Erez Gershnabel
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yehiam Prior
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ilya Sh Averbukh
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
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13
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Karras G, Ndong M, Hertz E, Sugny D, Billard F, Lavorel B, Faucher O. Polarization shaping for unidirectional rotational motion of molecules. Phys Rev Lett 2015; 114:103001. [PMID: 25815926 DOI: 10.1103/physrevlett.114.103001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Indexed: 05/20/2023]
Abstract
Control of the orientation of the angular momentum of linear molecules is demonstrated by means of laser polarization shaping. For this purpose, we combine two orthogonally polarized and partially time-overlapped femtosecond laser pulses so as to produce a spinning linear polarization which in turn induces unidirectional rotation of N2 molecules. The evolution of the rotational response is probed by a third laser beam that can be either linearly or circularly polarized. The physical observable is the frequency shift imparted to the probe beam as a manifestation of the angular Doppler effect. Our experimental results are confirmed by theoretical computations, which allow one to gain a deep physical insight into the laser-molecule interaction.
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Affiliation(s)
- G Karras
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - M Ndong
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - E Hertz
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - D Sugny
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - F Billard
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - B Lavorel
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - O Faucher
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
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14
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Bergamaschi V, Faucher O, Ressiot E, Bregigeon S, Obry V, Tamalet C, Poizot-Martin I. C-08: Impact de la charge virale HPV16 dans l’évolution d’une dysplasie anale. Med Mal Infect 2014. [DOI: 10.1016/s0399-077x(14)70134-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Cloarec N, Faucher O, Bregigeon S, Brunet C, Tamalet C, Cano C, Poizot Martin I. Kaposi's sarcoma in a treated and well-controlled HIV infected patient: Discussion on the role of immunosenescence. HIV & AIDS Review 2014. [DOI: 10.1016/j.hivar.2014.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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16
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Hartmann JM, Boulet C, Vieillard T, Chaussard F, Billard F, Faucher O, Lavorel B. Dissipation of alignment in CO2 gas: A comparison between ab initio predictions and experiments. J Chem Phys 2013; 139:024306. [DOI: 10.1063/1.4812770] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Béjot P, Cormier E, Hertz E, Lavorel B, Kasparian J, Wolf JP, Faucher O. High-field quantum calculation reveals time-dependent negative Kerr contribution. Phys Rev Lett 2013; 110:043902. [PMID: 25166165 DOI: 10.1103/physrevlett.110.043902] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Revised: 11/12/2012] [Indexed: 06/03/2023]
Abstract
The exact quantum time-dependent optical response of hydrogen under strong-field near-infrared excitation is investigated and compared to the perturbative model widely used for describing the effective atomic polarization induced by intense laser fields. By solving the full 3D time-dependent Schrödinger equation, we exhibit a supplementary, quasi-instantaneous defocusing contribution missing in the weak-field model of polarization. We show that this effect is far from being negligible, in particular when closures of ionization channels occur and stems from the interaction of electrons with their parent ions. It provides an interpretation of the higher-order Kerr effect recently observed in various gases.
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Affiliation(s)
- P Béjot
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - E Cormier
- Centre Lasers Intenses et Applications, Université de Bordeaux-CNRS-CEA, UMR 5107, 351 Cours de la Libération, F-33405 Talence, France
| | - E Hertz
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - B Lavorel
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - J Kasparian
- Université de Genève, GAP-Biophotonics, Chemin de Pinchat 22, 1211 Geneva 4, Switzerland
| | - J-P Wolf
- Université de Genève, GAP-Biophotonics, Chemin de Pinchat 22, 1211 Geneva 4, Switzerland
| | - O Faucher
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
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18
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Kasparian J, Béjot P, Petrarca M, Hertz S, Lavorel B, Faucher O, Wolf JP. Higher-order Kerr effects improve quantitative modelling of harmonics generation and laser filamentation. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134112007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Charpentier C, Joly V, Larrouy L, Fagard C, Visseaux B, de Verdiere NC, Raffi F, Yeni P, Descamps D, Aumaitre H, Medus M, Neuville S, Saada M, Abgrall S, Bentata M, Bouchaud O, Cailhol J, Cordel H, Dhote R, Gros H, Honore-Berlureau P, Huynh T, Krivitzky A, Mansouri R, Poupard M, Prendki V, Radia D, Rouges F, Touam F, Warde B, de Castro N, Colin de Verdiere N, Delgado J, Ferret S, Gallien S, Kandel T, Lafaurie M, Lagrange M, Lascoux-Combe C, Le D, Molina JM, Pavie J, Pintado C, Ponscarme D, Rachline A, Rozenbaum W, Sereni D, Taulera O, Estavoyer JM, Faucher JF, Foltzer A, Hoen B, Hustache-Mathieu L, Dupon M, Dutronc H, Neau D, Ragnaud JM, Raymond I, Boucly S, Lortholary O, Viard JP, Bechara C, Delfraissy JF, Ghosn J, Goujard C, Kamouh W, Mole M, Quertainmont Y, Bergmann JF, Boulanger E, Castillo H, Parrinello M, Rami A, Sellier P, Lepeu G, Pichancourt G, Bernard L, Berthe H, Clarissou J, Gory M, Melchior JC, Perronne C, Stegman S, de Truchis P, Derradji O, Malet M, Teicher E, Vittecoq D, Chakvetadze C, Fontaine C, Lukiana T, Pialloux G, Slama L, Bonnet D, Boucherit S, El Alami Talbi N, Fournier I, Gervais A, Joly V, Iordache L, Laurichesse JJ, Leport C, Pahlavan G, Phung BC, Yeni P, Bennamar N, Brunet A, Guillevin L, Salmon-Ceron D, Tahi T, Chesnel C, Dominguez S, Jouve P, Lelievre JD, Levy Y, Melica G, Sobel A, Ben Abdallah S, Bonmarchand M, Bricaire F, Herson S, Iguertsira M, Katlama C, Kouadio H, Schneider L, Simon A, Valantin MA, Abel S, Beaujolais V, Cabie A, Liauthaud B, Pierre Francois S, Abgueguen P, Chennebault JM, Loison J, Pichard E, Rabier V, Delaune J, Louis I, Morlat P, Pertusa MC, Brunel-Delmas F, Chiarello P, Jeanblanc F, Jourdain JJ, Livrozet JM, Makhloufi D, Touraine JL, Augustin-Normand C, Bailly F, Benmakhlouf N, Brochier C, Cotte L, Gueripel V, Koffi K, Lack P, Lebouche B, Maynard M, Miailhes P, Radenne S, Schlienger I, Thoirain V, Trepo C, Drogoul MP, Fabre G, Faucher O, Frixon-Marin V, Gastaut JA, Peyrouse E, Poizot-Martin I, Jacquet JM, Le Facher G, Merle de Boever C, Reynes J, Tramoni C, Allavena C, Billaud E, Biron C, Bonnet B, Bouchez S, Boutoille D, Brunet-Francois C, Hue H, Mounoury O, Raffi F, Reliquet V, Aubry O, Esnault JL, Leautez-Nainville S, Perre P, Suaud I, Breaud S, Ceppi C, Dellamonica P, De Salvador F, Durant J, Ferrando S, Fuzibet JG, Leplatois A, Mondain V, Perbost I, Pugliese P, Rahelinirina V, Rosenthal E, Sanderson F, Vassalo M, Arvieux C, Chapplain JM, Michelet C, Ratajczak M, Revest M, Souala F, Tattevin P, Cheneau C, Fischer P, Lang JM, Partisani M, Rey D, Bastides F, Besnier JM, Le Bret P, Choutet P, Dailloux JF, Guadagnin P, Nau P, Rivalain J, Soufflet A, Aissi E, Melliez H, Pavel S, Mouton Y, Yazdanpanah Y, Boyer L, Burty C, Letranchant L, May T, Wassoumbou S, Blum L, Danne O, Arthus MA, Dion P, Certain A, Tabuteau S, Beuscart A, Agher N, Frosch A, Couffin-Cadiergues S, Diallo A. Role and evolution of viral tropism in patients with advanced HIV disease receiving intensified initial regimen in the ANRS 130 APOLLO trial. J Antimicrob Chemother 2012; 68:690-6. [DOI: 10.1093/jac/dks455] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Béjot P, Hertz E, Kasparian J, Lavorel B, Wolf JP, Faucher O. Transition from plasma-driven to Kerr-driven laser filamentation. Phys Rev Lett 2011; 106:243902. [PMID: 21770572 DOI: 10.1103/physrevlett.106.243902] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Revised: 04/15/2011] [Indexed: 05/31/2023]
Abstract
While filaments are generally interpreted as a dynamic balance between Kerr focusing and plasma defocusing, the role of the higher-order Kerr effect (HOKE) is actively debated as a potentially dominant defocusing contribution to filament stabilization. In a pump-probe experiment supported by numerical simulations, we demonstrate the transition between two distinct filamentation regimes at 800 nm. For long pulses (1.2 ps), the plasma substantially contributes to filamentation, while this contribution vanishes for short pulses (70 fs). These results confirm the occurrence, in adequate conditions, of filamentation driven by the HOKE rather than by plasma.
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Affiliation(s)
- P Béjot
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 5209 CNRS-Université de Bourgogne, BP 47870, Dijon, France.
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21
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Béjot P, Hertz E, Lavorel B, Kasparian J, Wolf JP, Faucher O. From higher-order Kerr nonlinearities to quantitative modeling of third and fifth harmonic generation in argon. Opt Lett 2011; 36:828-830. [PMID: 21403698 DOI: 10.1364/ol.36.000828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The recent measurement of negative higher-order Kerr effect (HOKE) terms in gases has given rise to a controversial debate, fed by its impact on short laser pulse propagation. By comparing the experimentally measured yield of the third and fifth harmonics, with both an analytical and a full comprehensive numerical propagation model, we confirm the absolute and relative values of the reported HOKE indices.
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Affiliation(s)
- P Béjot
- Laboratoire Interdisciplinaire CARNOT de Bourgogne (ICB), UMR 5209 CNRS-Université de Bourgogne, Dijon, France
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22
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Skantzakis E, Tzallas P, Kruse JE, Kalpouzos C, Faucher O, Tsakiris GD, Charalambidis D. Tracking autoionizing-wave-packet dynamics at the 1-fs temporal scale. Phys Rev Lett 2010; 105:043902. [PMID: 20867844 DOI: 10.1103/physrevlett.105.043902] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Indexed: 05/29/2023]
Abstract
We present time-resolved studies and Fourier transform spectroscopy of inner-shell excited states undergoing Auger decay and doubly excited autoionizing states, utilizing coherent extreme-ultraviolet (XUV) radiation continua. Series of states spanning a range of ∼4 eV are excited simultaneously. An XUV probe pulse tracks the oscillatory and decaying evolution of the formed wave packet. The Fourier transform of the measured trace reproduces the spectrum of the series. The present work paves the way for ultrabroadband XUV spectroscopy and studies of ultrafast dynamics in all states of matter.
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Affiliation(s)
- E Skantzakis
- Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, GR-711 10 Heraklion, Crete, Greece
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23
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Loriot V, Hertz E, Lavorel B, Faucher O. High rate concentration measurement of molecular gas mixtures using a spatial detection technique. J Chem Phys 2010. [DOI: 10.1063/1.3427542] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Béjot P, Kasparian J, Henin S, Loriot V, Vieillard T, Hertz E, Faucher O, Lavorel B, Wolf JP. Higher-order Kerr terms allow ionization-free filamentation in gases. Phys Rev Lett 2010; 104:103903. [PMID: 20366427 DOI: 10.1103/physrevlett.104.103903] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Revised: 02/08/2010] [Indexed: 05/29/2023]
Abstract
We show that higher-order nonlinear indices (n(4), n(6), n(8), n(10)) provide the main defocusing contribution to self-channeling of ultrashort laser pulses in air and argon at 800 nm, in contrast with the previously accepted mechanism of filamentation where plasma was considered as the dominant defocusing process. Their consideration allows us to reproduce experimentally observed intensities and plasma densities in self-guided filaments.
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Affiliation(s)
- P Béjot
- Université de Genève, GAP-Biophotonics, 20 rue de l'Ecole de Médecine, 1211 Geneva 4, Switzerland
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25
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Tran H, Chaussard F, Le Cong N, Lavorel B, Faucher O, Joubert P. Femtosecond time resolved coherent anti-Stokes Raman spectroscopy of H2–N2 mixtures in the Dicke regime: Experiments and modeling of velocity effects. J Chem Phys 2009; 131:174310. [DOI: 10.1063/1.3257640] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Abstract
We measure the instantaneous electronic nonlinear refractive index of N(2), O(2) and Ar at room temperature for a 90 fs and 800 nm laser pulse. Measurements are calibrated by post-pulse molecular alignment through a polarization technique. At low intensity, quadratic coefficients n(2) are determined. At higher intensities, a strong negative contribution with a higher nonlinearity appears, which leads to an overall negative nonlinear Kerr refractive index in air above 26 TW/cm(2).
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Affiliation(s)
- V Loriot
- Institut Carnot de Bourgogne, UMR 5209 CNRS-Université de Bourgogne, 21078 Dijon Cedex, France
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27
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Poizot-Martin I, Faucher O, Obry-Roguet V, Nicolino-Brunet C, Drogoul-Vey MP, Dignat-George F, Tamalet C. H-02 Immunité fonctionnelle et charge virale intracellulaire après 10 ans de charge virale plasmatique indétectable (CVp). Med Mal Infect 2009. [DOI: 10.1016/s0399-077x(09)74375-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Rouzée A, Boudon V, Lavorel B, Faucher O, Raballand W. Rotational Raman spectroscopy of ethylene using a femtosecond time-resolved pump-probe technique. J Chem Phys 2005; 123:154309. [PMID: 16252950 DOI: 10.1063/1.2069866] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Femtosecond Raman-induced polarization spectroscopy (RIPS) was conducted at low pressure (250 mb at 295 K and 400 mb at 373 K) in ethylene. The temporal signal, resulting from the beating between pure rotational coherences, was measured with a heterodyne detection. The temporal traces were converted to the frequency domain using a Fourier transformation and then analyzed thanks to the D2hTDS software (http://www.u-bourgogne.fr/LPUB/shTDS.html) dedicated to X2Y4 molecules with D2h symmetry. The effective Hamiltonian was expanded up to order 2, allowing the determination of five parameters with an rms of 0.017 cm(-1). Special care was taken in the precise modeling of intensities, taking into account all instrumental effects. Relative intensities were fitted (with an rms of 7.2%) and two polarizability operators were determined.
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Affiliation(s)
- A Rouzée
- Laboratoire de Physique de l'Université de Bourgogne, CNRS UMR 5027, 9 Avenue A. Savary, BP 47870, F-21078 Dijon Cedex, France
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Daems D, Guérin S, Hertz E, Jauslin HR, Lavorel B, Faucher O. Field-free two-direction alignment alternation of linear molecules by elliptic laser pulses. Phys Rev Lett 2005; 95:063005. [PMID: 16090947 DOI: 10.1103/physrevlett.95.063005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2005] [Indexed: 05/03/2023]
Abstract
We show that a linear molecule subjected to a short specific elliptically polarized laser field yields post-pulse revivals exhibiting alignment alternatively located along the orthogonal axis and the major axis of the ellipse. The effect is experimentally demonstrated by measuring the optical Kerr effect along two different axes. The conditions ensuring an optimal field-free alternation of high alignments along both directions are derived.
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Affiliation(s)
- D Daems
- Laboratoire de Physique de l'Université de Bourgogne, UMR CNRS 5027, BP 47870, 21078 Dijon, France.
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Tran H, Joubert P, Bonamy L, Lavorel B, Renard V, Chaussard F, Faucher O, Sinardet B. Femtosecond time resolved coherent anti-Stokes Raman spectroscopy: experiment and modelization of speed memory effects on H2-N2 mixtures in the collision regime. J Chem Phys 2005; 122:194317. [PMID: 16161583 DOI: 10.1063/1.1894020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
With the aim of temperature diagnostic, femtosecond time-resolved CARS (coherent anti-Stokes Raman spectroscopy) is applied to probe H2 in H2-N2 mixtures. In a first part, a Lorentzian profile is used to model the femtosecond CARS response. A difference between the experimental broadening and the expected one is observed in the collision regime. The observed broadening increases strongly in an inhomogeneous way with respect to the perturber concentration. This is of considerable importance for temperature measurements. In a second part, we show that in the collision regime, this inhomogeneous broadening is due to the speed dependence of the collisional parameters and the memory effects of the radiator speed. A new modelization of the time-resolved CARS response taking into account the speed memory effects is presented and applied to the temperature diagnostic in H2-N2 mixtures. The numerical results are in good agreement with experiments.
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Affiliation(s)
- H Tran
- Laboratoire de Physique Moléculaire, UMR CNRS 6624, La Bouloie Université de Franche-Comté, 25030 Besançon Cedex, France and Laboratoire de Physique, UMR CNRS 5027, Université de Bourgogne, 21078 Dijon Cedex, France
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Shore BW, Charalambidis D, Shapiro M, Knight PL, Halfmann T, Bergmann K, Yatsenko LP, Faucher O, Cavalieri S, Lambropoulos P. Comment on "electromagnetically induced quantum memory". Phys Rev Lett 2004; 93:269301. [PMID: 15698040 DOI: 10.1103/physrevlett.93.269301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2004] [Indexed: 05/24/2023]
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Renard M, Chaux R, Lavorel B, Faucher O. Pulse trains produced by phase-modulation of ultrashort optical pulses: tailoring and characterization. Opt Express 2004; 12:473-482. [PMID: 19474847 DOI: 10.1364/opex.12.000473] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this paper, creation of pulse doublets and pulse trains by spectral phase modulation of ultrashort optical pulses is investigated. Pulse doublets with specific features are generated through step-like and triangular spectral phase modulation, whereas sequences of pulses with controllable delay and amplitude are produced via sinusoidal phase modulations. A temporal analysis of this type of tailored pulses is exposed and a complete characterization with the SPIDER technique (Spectral Phase Interferometry for Direct Electric-field Reconstruction) is presented.
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Renard V, Renard M, Guérin S, Pashayan YT, Lavorel B, Faucher O, Jauslin HR. Postpulse molecular alignment measured by a weak field polarization technique. Phys Rev Lett 2003; 90:153601. [PMID: 12732037 DOI: 10.1103/physrevlett.90.153601] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2002] [Indexed: 05/24/2023]
Abstract
We report a direct nonintrusive observation of alignment and planar delocalization of CO2 after an intense linearly polarized femtosecond laser pulse excitation. The effects are measured by a polarization technique involving a perturbative probe that itself does not induce appreciable alignment. We show that this technique allows one to measure a signal proportional to <cos((2)theta>-1/3, with theta the angle between the molecular axis and the laser polarization. Simulations that support this analysis allow one to characterize the experimentally observed alignment and planar delocalization quantitatively.
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Affiliation(s)
- V Renard
- Laboratoire de Physique, Université de Bourgogne, UMR CNRS 5027, BP 47870, 21078 Dijon Cedex, France
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Couris S, Renard M, Faucher O, Lavorel B, Chaux R, Koudoumas E, Michaut X. An experimental investigation of the nonlinear refractive index (n2) of carbon disulfide and toluene by spectral shearing interferometry and z-scan techniques. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(02)02021-3] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Guérin S, Yatsenko LP, Jauslin HR, Faucher O, Lavorel B. Orientation of polar molecules by laser induced adiabatic passage. Phys Rev Lett 2002; 88:233601. [PMID: 12059362 DOI: 10.1103/physrevlett.88.233601] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2001] [Indexed: 05/23/2023]
Abstract
We show that two overlapping linearly polarized laser pulses of frequencies omega and its second harmonic 2omega can strongly orient linear polar molecules, by adiabatic passage along dressed states. The resulting robust orientation can be interpreted as a laser-induced localization in the effective double well potential created by the fields, which induces a preliminary molecular alignment. The direction of the orientation can be selected by the relative phase of the fields.
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Affiliation(s)
- S Guérin
- Laboratoire de Physique de l'Université de Bourgogne, UMR CNRS 5027, BP 47870, 21078 Dijon, France.
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Hertz E, Chaux R, Faucher O, Lavorel B. Concentration measurements in molecular gas mixtures with a two-pump pulse femtosecond polarization spectroscopy technique. J Chem Phys 2001. [DOI: 10.1063/1.1389305] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hertz E, Faucher O, Lavorel B, Chaux R. Controlling molecular alignment rephasing through interference of Raman-induced rotational coherence. J Chem Phys 2000. [DOI: 10.1063/1.1309526] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Dupont J, Déroussiaux A, Coquard M, Lavorel B, Faucher O, Loëte M, Jauslin HR. Dynamical Stark Effect in the nu(2)/nu(4) Vibrational Polyad of SiH(4): Theory and Observation. J Mol Spectrosc 2000; 199:252-258. [PMID: 10637111 DOI: 10.1006/jmsp.1999.8013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report a theoretical and experimental investigation of the dynamical Stark effect in a tetrahedral molecule, silane (SiH(4)). We use a tetrahedral formalism and Floquet theory to calculate the absorption spectra for the molecule dressed by an intense nonresonant pulsed laser. Experimentally, the dynamical Stark effect is observed for transitions of the nu(2)/nu(4) vibrational polyad of SiH(4) by means of nanosecond diode laser absorption spectroscopy and a Nd:YAG laser excitation. Copyright 2000 Academic Press.
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Affiliation(s)
- J Dupont
- Laboratoire de Physique, CNRS, Dijon, 21078, France
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Karapanagioti NE, Faucher O, Shao YL, Charalambidis D, Bachau H, Cormier E. Observation of autoionization suppression through coherent population trapping. Phys Rev Lett 1995; 74:2431-2434. [PMID: 10057926 DOI: 10.1103/physrevlett.74.2431] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Charalambidis D, Lambropoulos P, Schröder H, Faucher O, Xu H, Wagner M, Fotakis C. Settling a long-standing question on strong-field double ionization. Phys Rev A 1994; 50:R2822-R2825. [PMID: 9911321 DOI: 10.1103/physreva.50.r2822] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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41
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Faucher O, Shao YL, Charalambidis D, Fotakis C. Laser-induced modification of a structured continuum observed in ionization and harmonic generation. Phys Rev A 1994; 50:641-648. [PMID: 9910934 DOI: 10.1103/physreva.50.641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Faucher O, Charalambidis D, Fotakis C, Zhang J, Lambropoulos P. Control of laser induced continuum structure in the vicinity of autoionizing states. Phys Rev Lett 1993; 70:3004-3007. [PMID: 10053751 DOI: 10.1103/physrevlett.70.3004] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Faucher O, Aguillon F, Campargue R. Third harmonic generation of extreme ultraviolet radiation in a nitrogen continuous free jet zone of silence. J Chem Phys 1991. [DOI: 10.1063/1.460647] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abstract
The possibilities of utilization of seawater enriched with ureas as the culture medium for a blue-green alga, Spirulina maxima, were investigated. Pretreatment by precipitation with NaHCO3 and (or) Na2CO3 was found essential to remove the excess amounts of Ca2+ and Mg2+ present in seawater prior to cultivation. A culture medium as good as the synthetic medium reported in the literature for the growth of S. maxima was obtained after treating seawater with NaHCO3 (19.2 g/L) at pH 9.2 and 35 degrees C for 2 h, filtering to remove precipitates, and enriching with K2HPO4 (0.5 g/L), NaNO3 (3.0 g/L), and FeSO4 (0.01 g/L). The same results were obtained by substituting a small amount (0.2 g/L or less) of either crystalline or polymerized urea for the NaNO3 in the above medium. Growth of S. maxima was inhibited at higher concentration of urea in the culture medium. The inhibition effect was due to the partial decomposition of urea into ammonia in alkali medium. Tests conducted on the 130-L cultivation open pond also confirmed that the seawater-urea medium supports growth of S. maxima as well as the best known synthetic medium.
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Delaire J, Ferré JC, Faucher O. [Clinical observations and reflections on condylar growth]. Actual Odontostomatol (Paris) 1970; 90:199-215. [PMID: 5424123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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47
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Delaire J, Billet J, Ferré JC, Faucher O, Julia P. [Facial malformations and asymmetry of the base of the skull. (A new malformation syndrome interesting from the orthodontic viewpoint)]. Revue Stomatol 1965; 66:379-96. [PMID: 5215332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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