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Prost E, Loriot V, Constant E, Compagnon I, Bergé L, Lépine F, Skupin S. Air-photonics terahertz platform with versatile micro-controller based interface and data acquisition. Rev Sci Instrum 2022; 93:033004. [PMID: 35365014 DOI: 10.1063/5.0082593] [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: 12/16/2021] [Accepted: 02/26/2022] [Indexed: 06/14/2023]
Abstract
We present a terahertz (THz) platform employing air plasma produced by an ultrashort two-color laser pulse as a broadband THz source and air biased coherent detection (ABCD) of the THz field. In contrast to previous studies, a simple peak detector connected to a micro-controller board acquires the ABCD-signal coming from the avalanche photodiode. Numerical simulations of the whole setup yield temporal and spectral profiles of the terahertz electric field in both source and detection area. The latter ones are in excellent agreement with our measurements, confirming THz electric fields with peak amplitude in the MV/cm range. We further illustrate the capabilities of the platform by performing THz spectroscopy of water vapor and a polystyrene reference sample.
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Affiliation(s)
- E Prost
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - V Loriot
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - E Constant
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - I Compagnon
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - L Bergé
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - F Lépine
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - S Skupin
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
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Hervé M, Castellanos P, Karras G, Despré V, Marciniak A, Constant E, Loriot V, Kuleff A, Tielens AGGM, Lépine F. PAH under XUV excitation: an ultrafast XUV-photochemistry experiment for astrophysics. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201920506012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Understanding processes induced by XUV excitation of Polycyclic Aromatic Hydrocarbons (PAHs) is at the heart of molecular astrophysics, which aims at understanding molecular evolution in interstellar media. We used ultrashort XUV pulses to produce highly excited PAHs cations. The photo-induced dynamics is probed using a pump-probe XUV-IR spectroscopy. By studying PAH from small (naphthalene) to large (hexabenzocoronene) PAHs, we show that the dynamic is governed by the large density of states, in which many-body quantum effects are dominant.
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Barillot T, Brédy R, Celep G, Cohen S, Compagnon I, Concina B, Constant E, Danakas S, Kalaitzis P, Karras G, Lépine F, Loriot V, Marciniak A, Predelus-Renois G, Schindler B, Bordas C. Influence of long-range Coulomb interaction in velocity map imaging. J Chem Phys 2017; 147:013929. [PMID: 28688435 DOI: 10.1063/1.4982616] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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
The standard velocity-map imaging (VMI) analysis relies on the simple approximation that the residual Coulomb field experienced by the photoelectron ejected from a neutral or ion system may be neglected. Under this almost universal approximation, the photoelectrons follow ballistic (parabolic) trajectories in the externally applied electric field, and the recorded image may be considered as a 2D projection of the initial photoelectron velocity distribution. There are, however, several circumstances where this approximation is not justified and the influence of long-range forces must absolutely be taken into account for the interpretation and analysis of the recorded images. The aim of this paper is to illustrate this influence by discussing two different situations involving isolated atoms or molecules where the analysis of experimental images cannot be performed without considering long-range Coulomb interactions. The first situation occurs when slow (meV) photoelectrons are photoionized from a neutral system and strongly interact with the attractive Coulomb potential of the residual ion. The result of this interaction is the formation of a more complex structure in the image, as well as the appearance of an intense glory at the center of the image. The second situation, observed also at low energy, occurs in the photodetachment from a multiply charged anion and it is characterized by the presence of a long-range repulsive potential. Then, while the standard VMI approximation is still valid, the very specific features exhibited by the recorded images can be explained only by taking into consideration tunnel detachment through the repulsive Coulomb barrier.
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Affiliation(s)
- T Barillot
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - R Brédy
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - G Celep
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - S Cohen
- Atomic and Molecular Physics Laboratory, Physics Department, University of Ioannina, 45110 Ioannina, Greece
| | - I Compagnon
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - B Concina
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - E Constant
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - S Danakas
- Atomic and Molecular Physics Laboratory, Physics Department, University of Ioannina, 45110 Ioannina, Greece
| | - P Kalaitzis
- Atomic and Molecular Physics Laboratory, Physics Department, University of Ioannina, 45110 Ioannina, Greece
| | - G Karras
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - F Lépine
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - V Loriot
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - A Marciniak
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - G Predelus-Renois
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - B Schindler
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
| | - C Bordas
- Institut Lumière Matière, Université de Lyon, CNRS, UMR5306, 69622 Villeurbanne, France
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Despré V, Marciniak A, Loriot V, Galbraith MCE, Rouzée A, Vrakking MJJ, Lépine F, Kuleff AI. Attosecond Hole Migration in Benzene Molecules Surviving Nuclear Motion. J Phys Chem Lett 2015; 6:426-31. [PMID: 26261959 DOI: 10.1021/jz502493j] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Hole migration is a fascinating process driven by electron correlation, in which purely electronic dynamics occur on a very short time scale in complex ionized molecules, prior to the onset of nuclear motion. However, it is expected that due to coupling to the nuclear dynamics, these oscillations will be rapidly damped and smeared out, which makes experimental observation of the hole migration process rather difficult. In this Letter, we demonstrate that the instantaneous ionization of benzene molecules initiates an ultrafast hole migration characterized by a periodic breathing of the hole density between the carbon ring and surrounding hydrogen atoms on a subfemtosecond time scale. We show that these oscillations survive the dephasing introduced by the nuclear motion for a long enough time to allow their observation. We argue that this offers an ideal benchmark for studying the influence of hole migration on molecular reactivity.
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Affiliation(s)
- V Despré
- †Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306, 10 Rue Ada Byron, 69622 Villeurbanne Cedex, France
| | - A Marciniak
- †Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306, 10 Rue Ada Byron, 69622 Villeurbanne Cedex, France
| | - V Loriot
- †Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306, 10 Rue Ada Byron, 69622 Villeurbanne Cedex, France
| | - M C E Galbraith
- ‡Max-Born-Institut, Max Born Strasse 2A, D-12489 Berlin, Germany
| | - A Rouzée
- ‡Max-Born-Institut, Max Born Strasse 2A, D-12489 Berlin, Germany
| | - M J J Vrakking
- ‡Max-Born-Institut, Max Born Strasse 2A, D-12489 Berlin, Germany
| | - F Lépine
- †Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306, 10 Rue Ada Byron, 69622 Villeurbanne Cedex, France
| | - A I Kuleff
- §Theoretische Chemie, PCI, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
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Martínez-Matos Ó, Vaveliuk P, Izquierdo JG, Loriot V. Femtosecond spatial pulse shaping at the focal plane. Opt Express 2013; 21:25010-25025. [PMID: 24150344 DOI: 10.1364/oe.21.025010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Spatial shaping of ultrashort laser beams at the focal plane is theoretically analyzed. The description of the pulse is performed by its expansion in terms of Laguerre-Gaussian orthonormal modes. This procedure gives both a comprehensive interpretation of the propagation dynamics and the required signal to encode onto a spatial light modulator for spatial shaping, without using iterative algorithms. As an example, pulses with top-hat and annular spatial profiles are designed and their dynamics analyzed. The interference of top-hat pulses is also investigated finding potential applications in high precision pump-probe experiments (without using delay lines) and for the creation of subwavelength ablation patterns. In addition, a novel class of ultrashort pulses possessing non-stationary orbital angular momentum is also proposed. These exotic pulses provide additional degrees of freedom that open up new perspectives in fields such as laser-matter interaction and micro-machining.
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Balerdi G, Corrales ME, Gitzinger G, González-Vázquez J, Solá IR, Loriot V, de Nalda R, Bañares L. Dynamic Stark shift of the3R1Rydberg state of CH3I. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134102035] [Citation(s) in RCA: 5] [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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Gitzinger G, Corrales ME, Loriot V, de Nalda R, Bañares L. A femtosecond velocity map imaging study on B-band predissociation in CH3I. II. The 201 and 301 vibronic levels. J Chem Phys 2012; 136:074303. [DOI: 10.1063/1.3683252] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [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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de Nalda R, Durá J, González-Vázquez J, Loriot V, Bañares L. The primary step in the ultrafast photodissociation of the methyl iodide dimer. Phys Chem Chem Phys 2011; 13:13295-304. [DOI: 10.1039/c1cp20083f] [Citation(s) in RCA: 6] [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: 11/21/2022]
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Gitzinger G, Corrales ME, Loriot V, Amaral GA, de Nalda R, Bañares L. A femtosecond velocity map imaging study on B-band predissociation in CH3I. I. The band origin. J Chem Phys 2010; 132:234313. [DOI: 10.1063/1.3455207] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [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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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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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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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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