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Szatmári S, Nagy T, Dajka R, Kedves MÁ, Aladi M, Földes IB. Temporal contrast enhancement of a Ti:Sapphire laser by nonlinear Fourier filtering. OPTICS EXPRESS 2024; 32:17038-17047. [PMID: 38858896 DOI: 10.1364/oe.521567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Accepted: 03/14/2024] [Indexed: 06/12/2024]
Abstract
Temporal cleaning of high-power infrared (IR) pulses generated by a Ti:Sapphire system is demonstrated by the use of the Nonlinear Fourier Filtering (NFF) method. In a proof-of-principle experiment suppression of up to 1000 is achieved for the temporal pedestal prior to the main pulse, with a moderate (20-25%) overall throughput. This includes the same suppression ratio for the picosecond coherent pedestal in the direct vicinity of the main pulse. Based on the instantaneous, intensity-dependent and high-order switching characteristics of NFF, excellent pulse cleaning performance is observed. The efficient, high-contrast removal of the coherent pedestal from the foot of the main pulse even if its duration is shorter than 100 fs is compared with the capability of the plasma mirror technique. Calculations are also performed, supporting the experimentally observed sharp intensity dependence of the switching process, pointing out the dominant role of the ionization-based refractive index change.
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2
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Xuan Y, Shen X, Liang W, Xu Y, Chen R, Du S, Wang P, Liu J, Li R. Dynamic range enhancement of self-referenced spectral interferometry with extended time excursion method by the cascaded Kerr lens process. APPLIED OPTICS 2023; 62:7441-7446. [PMID: 37855512 DOI: 10.1364/ao.501425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 09/15/2023] [Indexed: 10/20/2023]
Abstract
Self-referenced spectral interferometry with extended time excursion (SRSI-ETE) is a powerful method for single-shot characterization of the temporal contrast of a high peak power laser, which has high temporal resolution but a low dynamic range. Here, a temporal contrast reduction method is proposed that uses the cascaded Kerr lens process in two thin glass plates. Combined with the SRSI-ETE method, the measurement dynamic range of the method is increased about two orders of magnitude while having a 20 fs temporal resolution and a 40 ps time window in single shot.
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3
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Dover NP, Ziegler T, Assenbaum S, Bernert C, Bock S, Brack FE, Cowan TE, Ditter EJ, Garten M, Gaus L, Goethel I, Hicks GS, Kiriyama H, Kluge T, Koga JK, Kon A, Kondo K, Kraft S, Kroll F, Lowe HF, Metzkes-Ng J, Miyatake T, Najmudin Z, Püschel T, Rehwald M, Reimold M, Sakaki H, Schlenvoigt HP, Shiokawa K, Umlandt MEP, Schramm U, Zeil K, Nishiuchi M. Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities. LIGHT, SCIENCE & APPLICATIONS 2023; 12:71. [PMID: 36914618 PMCID: PMC10011581 DOI: 10.1038/s41377-023-01083-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 01/16/2023] [Accepted: 01/30/2023] [Indexed: 06/18/2023]
Abstract
Laser-driven ion sources are a rapidly developing technology producing high energy, high peak current beams. Their suitability for applications, such as compact medical accelerators, motivates development of robust acceleration schemes using widely available repetitive ultraintense femtosecond lasers. These applications not only require high beam energy, but also place demanding requirements on the source stability and controllability. This can be seriously affected by the laser temporal contrast, precluding the replication of ion acceleration performance on independent laser systems with otherwise similar parameters. Here, we present the experimental generation of >60 MeV protons and >30 MeV u-1 carbon ions from sub-micrometre thickness Formvar foils irradiated with laser intensities >1021 Wcm2. Ions are accelerated by an extreme localised space charge field ≳30 TVm-1, over a million times higher than used in conventional accelerators. The field is formed by a rapid expulsion of electrons from the target bulk due to relativistically induced transparency, in which relativistic corrections to the refractive index enables laser transmission through normally opaque plasma. We replicate the mechanism on two different laser facilities and show that the optimum target thickness decreases with improved laser contrast due to reduced pre-expansion. Our demonstration that energetic ions can be accelerated by this mechanism at different contrast levels relaxes laser requirements and indicates interaction parameters for realising application-specific beam delivery.
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Affiliation(s)
- Nicholas P Dover
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
- The John Adams Institute for Accelerator Science, Blackett Laboratory, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Tim Ziegler
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Stefan Assenbaum
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Constantin Bernert
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Stefan Bock
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Florian-Emanuel Brack
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Thomas E Cowan
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Emma J Ditter
- The John Adams Institute for Accelerator Science, Blackett Laboratory, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Marco Garten
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Lennart Gaus
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Ilja Goethel
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - George S Hicks
- The John Adams Institute for Accelerator Science, Blackett Laboratory, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Hiromitsu Kiriyama
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
| | - Thomas Kluge
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - James K Koga
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
| | - Akira Kon
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
| | - Kotaro Kondo
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
| | - Stephan Kraft
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Florian Kroll
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Hazel F Lowe
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
| | | | - Tatsuhiko Miyatake
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga-Koen, Kasuga, Fukuoka, 816-8580, Japan
| | - Zulfikar Najmudin
- The John Adams Institute for Accelerator Science, Blackett Laboratory, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Thomas Püschel
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Martin Rehwald
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Marvin Reimold
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Hironao Sakaki
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga-Koen, Kasuga, Fukuoka, 816-8580, Japan
| | | | - Keiichiro Shiokawa
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga-Koen, Kasuga, Fukuoka, 816-8580, Japan
| | - Marvin E P Umlandt
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Ulrich Schramm
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - Karl Zeil
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany.
| | - Mamiko Nishiuchi
- Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan.
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4
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Bock S, Oksenhendler T, Püschel T, Gebhardt R, Helbig U, Pausch R, Ziegler T, Bernert C, Zeil K, Irman A, Toncian T, Kiriyama H, Nishiuchi M, Kon A, Schramm U. Spectral-temporal measurement capabilities of third-order correlators. OPTICS EXPRESS 2023; 31:9923-9934. [PMID: 37157556 DOI: 10.1364/oe.475575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We present a method extending scanning third-order correlator temporal pulse evolution measurement capabilities of high power short pulse lasers to spectral sensitivity within the spectral range exploited by typical chirped pulse amplification systems. Modelling of the spectral response achieved by angle tuning of the third harmonic generating crystal is applied and experimentally validated. Exemplary measurements of spectrally resolved pulse contrast of a Petawatt laser frontend illustrate the importance of full bandwidth coverage for the interpretation of relativistic laser target interaction in particular for the case of solid targets.
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5
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Ding F, Ouyang X, Zhang X, Jiang Y, Hou K, Jiang X, Tao H, Zhu B, Liu D, Zhu J, Zhu J. Universal nanosecond range pulse contrast measurement for a kJ-class petawatt laser. APPLIED OPTICS 2021; 60:10016-10023. [PMID: 34807104 DOI: 10.1364/ao.440823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 10/13/2021] [Indexed: 06/13/2023]
Abstract
A single-shot measuring apparatus with optical limiting for temporal pulse contrast of kJ-class petawatt lasers in the nanosecond range is proposed. A temporal linear filter comprising an electro-optical switch, a polarizer, a temporal nonlinear filter composed of cascaded SHG crystals, and a dichromatic mirror are, respectively, used as an optical limiting apparatus for contrast measurement of nanosecond and picosecond pulses to improve dynamic range and temporal resolution. The apparatus has been applied to pulse contrast measurements at the SG-II petawatt facility, achieving a high dynamic range of 1010 and a fast time resolution of 107 ps in the 350 ns range. This technique can also be universally applied to the limiting of the main pulse of varying pulse widths to diagnose pre-pulses during generation and transmission.
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6
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Wang P, Shen X, Huang S, Liu J. Cross-polarized wave-generation-based single-shot fourth-order autocorrelator. APPLIED OPTICS 2021; 60:5912-5916. [PMID: 34263813 DOI: 10.1364/ao.426217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/14/2021] [Indexed: 06/13/2023]
Abstract
A single-shot fourth-order autocorrelator based on cross-polarized wave generation (XPW) is proposed for the temporal contrast measurement, where the XPW process has the advantages of higher energy conversion efficiency, more compact setup, and less sensitivity to misalignment in comparison to the self-diffraction process. The measurement dynamic of 1012 is obtained with only 6 mJ input laser pulse, where the input beam for XPW is focused by a cylindrical lens and XPW signal with the energy of 400 µJ and time duration of 27.2 fs is obtained. Furthermore, beta-barium borate crystal with the thickness of 6 mm and cutting angle of 56° is used for the sum-frequency generation process to benefit the correlation efficiency. The compact setup could help explore the temporal contrast property of the high-power laser pulse.
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7
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Proton beam quality enhancement by spectral phase control of a PW-class laser system. Sci Rep 2021; 11:7338. [PMID: 33795713 PMCID: PMC8017008 DOI: 10.1038/s41598-021-86547-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 03/16/2021] [Indexed: 11/08/2022] Open
Abstract
We report on experimental investigations of proton acceleration from solid foils irradiated with PW-class laser-pulses, where highest proton cut-off energies were achieved for temporal pulse parameters that varied significantly from those of an ideally Fourier transform limited (FTL) pulse. Controlled spectral phase modulation of the driver laser by means of an acousto-optic programmable dispersive filter enabled us to manipulate the temporal shape of the last picoseconds around the main pulse and to study the effect on proton acceleration from thin foil targets. The results show that applying positive third order dispersion values to short pulses is favourable for proton acceleration and can lead to maximum energies of 70 MeV in target normal direction at 18 J laser energy for thin plastic foils, significantly enhancing the maximum energy compared to ideally compressed FTL pulses. The paper further proves the robustness and applicability of this enhancement effect for the use of different target materials and thicknesses as well as laser energy and temporal intensity contrast settings. We demonstrate that application relevant proton beam quality was reliably achieved over many months of operation with appropriate control of spectral phase and temporal contrast conditions using a state-of-the-art high-repetition rate PW laser system.
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8
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Leshchenko VE, Kessel A, Jahn O, Krüger M, Münzer A, Trushin SA, Veisz L, Major Z, Karsch S. On-target temporal characterization of optical pulses at relativistic intensity. LIGHT, SCIENCE & APPLICATIONS 2019; 8:96. [PMID: 31666950 PMCID: PMC6813334 DOI: 10.1038/s41377-019-0207-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 09/19/2019] [Accepted: 10/02/2019] [Indexed: 06/10/2023]
Abstract
High-field experiments are very sensitive to the exact value of the peak intensity of an optical pulse due to the nonlinearity of the underlying processes. Therefore, precise knowledge of the pulse intensity, which is mainly limited by the accuracy of the temporal characterization, is a key prerequisite for the correct interpretation of experimental data. While the detection of energy and spatial profile is well established, the unambiguous temporal characterization of intense optical pulses, another important parameter required for intensity evaluation, remains a challenge, especially at relativistic intensities and a few-cycle pulse duration. Here, we report on the progress in the temporal characterization of intense laser pulses and present the relativistic surface second harmonic generation dispersion scan (RSSHG-D-scan)-a new approach allowing direct on-target temporal characterization of high-energy, few-cycle optical pulses at relativistic intensity.
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Affiliation(s)
- Vyacheslav E. Leshchenko
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany
- Present Address: Department of Physics, The Ohio State University, Columbus, OH 43210 USA
| | - Alexander Kessel
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany
| | - Olga Jahn
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany
| | - Mathias Krüger
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany
| | - Andreas Münzer
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany
| | - Sergei A. Trushin
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany
| | - Laszlo Veisz
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department of Physics, Umeå University, Umeå, SE-901 87 Sweden
| | - Zsuzsanna Major
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - Stefan Karsch
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany
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9
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Haffa D, Bin J, Speicher M, Allinger K, Hartmann J, Kreuzer C, Ridente E, Ostermayr TM, Schreiber J. Temporally Resolved Intensity Contouring (TRIC) for characterization of the absolute spatio-temporal intensity distribution of a relativistic, femtosecond laser pulse. Sci Rep 2019; 9:7697. [PMID: 31118430 PMCID: PMC6531490 DOI: 10.1038/s41598-019-42683-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 04/05/2019] [Indexed: 12/03/2022] Open
Abstract
Today’s high-power laser systems are capable of reaching photon intensities up to 1022 W cm−2, generating plasmas when interacting with material. The high intensity and ultrashort laser pulse duration (fs) make direct observation of plasma dynamics a challenging task. In the field of laser-plasma physics and especially for the acceleration of ions, the spatio-temporal intensity distribution is one of the most critical aspects. We describe a novel method based on a single-shot (i.e. single laser pulse) chirped probing scheme, taking nine sequential frames at frame rates up to THz. This technique, to which we refer as temporally resolved intensity contouring (TRIC) enables single-shot measurement of laser-plasma dynamics. Using TRIC, we demonstrate the reconstruction of the complete spatio-temporal intensity distribution of a high-power laser pulse in the focal plane at full pulse energy with sub-picosecond resolution.
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Affiliation(s)
- Daniel Haffa
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany.
| | - Jianhui Bin
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany. .,Accelerator Technology and Applied Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
| | - Martin Speicher
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany.
| | - Klaus Allinger
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany
| | - Jens Hartmann
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany
| | - Christian Kreuzer
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany
| | - Enrico Ridente
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany.,Max-Planck-Institut für Quantenoptik, 85748, Garching b. München, Germany
| | - Tobias M Ostermayr
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany.,Max-Planck-Institut für Quantenoptik, 85748, Garching b. München, Germany.,Accelerator Technology and Applied Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Jörg Schreiber
- Lehrstuhl für Medizinphysik, Fakultät für Physik, Ludwig-Maximillians-Universität München, 85748, Garching b. München, Germany
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10
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Shen X, Wang P, Zhu J, Si Z, Zhao Y, Liu J, Li R. Temporal contrast reduction techniques for high dynamic-range temporal contrast measurement. OPTICS EXPRESS 2019; 27:10586-10601. [PMID: 31052915 DOI: 10.1364/oe.27.010586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 03/22/2019] [Indexed: 06/09/2023]
Abstract
A single-shot characterization of the temporal contrast of a petawatt laser pulse with a high dynamic-range, is important not only for improving conditions of the petawatt laser facility itself, but also for various high-intensity laser physics experiments, which is still a difficult problem. In this study, a new idea for improving the dynamic-range of a single-shot temporal contrast measurement using novel temporal contrast reduction techniques is proposed. The proof-of-principle experiments applying single stage of pulse stretching, anti-saturated absorption, or optical Kerr effect successfully reduce the temporal contrast by approximately one order of magnitude. Combining with the SRSI-ETE method, its dynamic-range characterization capability is improved by approximately one order of magnitude to approximately 109. It is expected that a higher dynamic-range temporal contrast can be characterized by using cascaded temporal contrast reduction processes. The proposed techniques can also be used in the delay-scanning temporal contrast measurement to improve its dynamic range.
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11
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Sukiasyan M, Karapetyan N, Toneyan H, Kutuzyan A, Mouradian L. Measurement of the ultrashort pulse spectral phase based on dispersive Fourier transformation. APPLIED OPTICS 2019; 58:2817-2822. [PMID: 31044882 DOI: 10.1364/ao.58.002817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 03/08/2019] [Indexed: 06/09/2023]
Abstract
A technique for measuring the spectral phase of an ultrashort pulse is developed based on the dispersive Fourier transformation method, as an alternative to spectral interferometric methods. The pulse spectral phase is measured by transferring the information from the spectral to the temporal domain by stretching the pulse to reach the far field of dispersion. We have implemented the technique through sum-frequency generation by using the laser pulse as a reference and have experimentally demonstrated the direct spectral phase measurement of various amplitude-modulated pulses.
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12
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Wang P, Shen X, Liu J, Li R. Generation of high-energy clean multicolored ultrashort pulses and their application in single-shot temporal contrast measurement. OPTICS EXPRESS 2019; 27:6536-6548. [PMID: 30876237 DOI: 10.1364/oe.27.006536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 02/04/2019] [Indexed: 06/09/2023]
Abstract
We demonstrate the generation of 100-μJ-level multicolored femtosecond pulses based on a single-stage cascaded four-wave mixing (CFWM) process in a thin glass plate by using cylinder lenses. The generated high-energy CFWM signals can shift the central wavelength and have well-enhanced temporal contrast because of the third-order nonlinear process. They are innovatively used as clean sampling pulses of a cross-correlator for single-shot temporal contrast measurement. With a simple homemade setup, the proof-of-principle experimental results demonstrate the single-shot cross-correlator with dynamic range of 1010, temporal resolution of about 160 fs and temporal window of 50 ps. To the best of our knowledge, this is the first demonstration in which both the dynamic range and the temporal resolution of a single-shot temporal contrast measurement are comparable to those of a commercial delay-scanning cross-correlator.
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