Y. Zobus, C. Brabetz, J. Hornung, J. Ohland, D. Reemts, J. Zou, M. Loeser, D. Albach, U. Schramm, V. Bagnoud
Abstract We report on the development of an ultrafast optical parametric amplifier front-end for the Petawatt High Energy Laser for heavy Ion eXperiments (PHELIX) and the Petawatt ENergy-Efficient Laser for Optical Plasma Experiments (PEnELOPE) facilities. This front-end delivers broadband and stable amplification up to 1 mJ per pulse while maintaining a high beam quality. Its implementation at PHELIX allowed one to bypass the front-end amplifier, which is known to be a source of pre-pulses. With the bypass, an amplified spontaneous emission contrast of $4.9times {10}^{-13}$ and a pre-pulse contrast of $6.2times {10}^{-11}$ could be realized. Due to its high stability, high beam quality and its versatile pump amplifier, the system offers an alternative for high-gain regenerative amplifiers in the front-end of various laser systems.
{"title":"Millijoule ultrafast optical parametric amplification as replacement for high-gain regenerative amplifiers","authors":"Y. Zobus, C. Brabetz, J. Hornung, J. Ohland, D. Reemts, J. Zou, M. Loeser, D. Albach, U. Schramm, V. Bagnoud","doi":"10.1017/hpl.2023.30","DOIUrl":"https://doi.org/10.1017/hpl.2023.30","url":null,"abstract":"Abstract We report on the development of an ultrafast optical parametric amplifier front-end for the Petawatt High Energy Laser for heavy Ion eXperiments (PHELIX) and the Petawatt ENergy-Efficient Laser for Optical Plasma Experiments (PEnELOPE) facilities. This front-end delivers broadband and stable amplification up to 1 mJ per pulse while maintaining a high beam quality. Its implementation at PHELIX allowed one to bypass the front-end amplifier, which is known to be a source of pre-pulses. With the bypass, an amplified spontaneous emission contrast of \u0000$4.9times {10}^{-13}$\u0000 and a pre-pulse contrast of \u0000$6.2times {10}^{-11}$\u0000 could be realized. Due to its high stability, high beam quality and its versatile pump amplifier, the system offers an alternative for high-gain regenerative amplifiers in the front-end of various laser systems.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"17 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82981197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiexi Zuo, Hai-juan Yu, S. Zou, Z. Dong, Chao-jian He, Shuang Xu, Chaoyu Ning, X. Chen, Xinyao Li, Xuechun Lin
Abstract Achieving an all-fiber ultra-fast system with above kW average power and mJ pulse energy is extremely challenging. This paper demonstrated a picosecond monolithic master oscillator power amplifier system at a 25 MHz repetition frequency with an average power of approximately 1.2 kW, a pulse energy of approximately 48 μJ and a peak power of approximately 0.45 MW. The nonlinear effects were suppressed by adopting a dispersion stretched seed pulse (with a narrow linewidth of 0.052 nm) and a multi-mode master amplifier with an extra-large mode area; then an ultimate narrow bandwidth of 1.32 nm and a moderately broadened pulse of approximately 107 ps were achieved. Meanwhile, the great spatio-temporal stability was verified experimentally, and no sign of transverse mode instability appeared even at the maximum output power. The system has shown great power and energy capability with a sacrificed beam propagation product of 5.28 mm $cdot$ mrad. In addition, further scaling of the peak power and pulse energy can be achieved by employing a lower repetition and a conventional compressor.
{"title":"1.2 kW all-fiber narrow-linewidth picosecond MOPA system","authors":"Jiexi Zuo, Hai-juan Yu, S. Zou, Z. Dong, Chao-jian He, Shuang Xu, Chaoyu Ning, X. Chen, Xinyao Li, Xuechun Lin","doi":"10.1017/hpl.2023.26","DOIUrl":"https://doi.org/10.1017/hpl.2023.26","url":null,"abstract":"Abstract Achieving an all-fiber ultra-fast system with above kW average power and mJ pulse energy is extremely challenging. This paper demonstrated a picosecond monolithic master oscillator power amplifier system at a 25 MHz repetition frequency with an average power of approximately 1.2 kW, a pulse energy of approximately 48 μJ and a peak power of approximately 0.45 MW. The nonlinear effects were suppressed by adopting a dispersion stretched seed pulse (with a narrow linewidth of 0.052 nm) and a multi-mode master amplifier with an extra-large mode area; then an ultimate narrow bandwidth of 1.32 nm and a moderately broadened pulse of approximately 107 ps were achieved. Meanwhile, the great spatio-temporal stability was verified experimentally, and no sign of transverse mode instability appeared even at the maximum output power. The system has shown great power and energy capability with a sacrificed beam propagation product of 5.28 mm \u0000$cdot$\u0000 mrad. In addition, further scaling of the peak power and pulse energy can be achieved by employing a lower repetition and a conventional compressor.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"13 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83536544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xin Zeng, S. Cui, Huawei Jiang, Bowen Ruan, Xin Cheng, Jiaqi Zhou, Zhiquan Lin, Xuezong Yang, Weibiao Chen, Yan Feng
Abstract The phase summation effect in sum-frequency mixing process is utilized to avoid a nonlinearity obstacle in the power scaling of single-frequency visible or ultraviolet lasers. Two single-frequency fundamental lasers are spectrally broadened by phase modulation to suppress stimulated Brillouin scattering in fiber amplifier and achieve higher power. After sum-frequency mixing in a nonlinear optical crystal, the upconverted laser returns to single frequency due to phase summation, when the phase modulations on two fundamental lasers have a similar amplitude but opposite sign. The method was experimentally proved in a Raman fiber amplifier-based laser system, which generated a power-scalable sideband-free single-frequency 590 nm laser. The proposal manifests the importance of phase operation in wave-mixing processes for precision laser technology.
{"title":"Single-frequency upconverted laser generation by phase summation","authors":"Xin Zeng, S. Cui, Huawei Jiang, Bowen Ruan, Xin Cheng, Jiaqi Zhou, Zhiquan Lin, Xuezong Yang, Weibiao Chen, Yan Feng","doi":"10.1017/hpl.2023.28","DOIUrl":"https://doi.org/10.1017/hpl.2023.28","url":null,"abstract":"Abstract The phase summation effect in sum-frequency mixing process is utilized to avoid a nonlinearity obstacle in the power scaling of single-frequency visible or ultraviolet lasers. Two single-frequency fundamental lasers are spectrally broadened by phase modulation to suppress stimulated Brillouin scattering in fiber amplifier and achieve higher power. After sum-frequency mixing in a nonlinear optical crystal, the upconverted laser returns to single frequency due to phase summation, when the phase modulations on two fundamental lasers have a similar amplitude but opposite sign. The method was experimentally proved in a Raman fiber amplifier-based laser system, which generated a power-scalable sideband-free single-frequency 590 nm laser. The proposal manifests the importance of phase operation in wave-mixing processes for precision laser technology.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"23 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89185623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Xu, M. Streeter, O. Ettlinger, H. Ahmed, S. Astbury, M. Borghesi, N. Bourgeois, C. Curry, S. Dann, N. Dover, T. Dzelzainis, V. Istokskaia, M. Gauthier, L. Giuffrida, G. Glenn, S. Glenzer, R. Gray, J. Green, G. Hicks, C. Hyland, M. King, B. Loughran, D. Margarone, O. McCusker, P. McKenna, C. Parisuaña, P. Parsons, C. Spindloe, D. Symes, F. Treffert, C. Palmer, Z. Najmudin
Abstract We present the development and characterization of a high-stability, multi-material, multi-thickness tape-drive target for laser-driven acceleration at repetition rates of up to 100 Hz. The tape surface position was measured to be stable on the sub-micrometre scale, compatible with the high-numerical aperture focusing geometries required to achieve relativistic intensity interactions with the pulse energy available in current multi-Hz and near-future higher repetition-rate lasers ( $>$ kHz). Long-term drift was characterized at 100 Hz demonstrating suitability for operation over extended periods. The target was continuously operated at up to 5 Hz in a recent experiment for 70,000 shots without intervention by the experimental team, with the exception of tape replacement, producing the largest data-set of relativistically intense laser–solid foil measurements to date. This tape drive provides robust targetry for the generation and study of high-repetition-rate ion beams using next-generation high-power laser systems, also enabling wider applications of laser-driven proton sources.
{"title":"Versatile tape-drive target for high-repetition-rate laser-driven proton acceleration","authors":"N. Xu, M. Streeter, O. Ettlinger, H. Ahmed, S. Astbury, M. Borghesi, N. Bourgeois, C. Curry, S. Dann, N. Dover, T. Dzelzainis, V. Istokskaia, M. Gauthier, L. Giuffrida, G. Glenn, S. Glenzer, R. Gray, J. Green, G. Hicks, C. Hyland, M. King, B. Loughran, D. Margarone, O. McCusker, P. McKenna, C. Parisuaña, P. Parsons, C. Spindloe, D. Symes, F. Treffert, C. Palmer, Z. Najmudin","doi":"10.1017/hpl.2023.27","DOIUrl":"https://doi.org/10.1017/hpl.2023.27","url":null,"abstract":"Abstract We present the development and characterization of a high-stability, multi-material, multi-thickness tape-drive target for laser-driven acceleration at repetition rates of up to 100 Hz. The tape surface position was measured to be stable on the sub-micrometre scale, compatible with the high-numerical aperture focusing geometries required to achieve relativistic intensity interactions with the pulse energy available in current multi-Hz and near-future higher repetition-rate lasers ( \u0000$>$\u0000 kHz). Long-term drift was characterized at 100 Hz demonstrating suitability for operation over extended periods. The target was continuously operated at up to 5 Hz in a recent experiment for 70,000 shots without intervention by the experimental team, with the exception of tape replacement, producing the largest data-set of relativistically intense laser–solid foil measurements to date. This tape drive provides robust targetry for the generation and study of high-repetition-rate ion beams using next-generation high-power laser systems, also enabling wider applications of laser-driven proton sources.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"34 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89903739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Fan, Tongjun Xu, Shun Li, Zhangli Xu, Jiancai Xu, Jianqiang Zhu, B. Shen, L. Ji
Abstract Laser-accelerated electrons are promising in producing gamma-photon beams of high peak flux for the study of nuclear photonics, obtaining copious positrons and exploring photon–photon interaction in vacuum. We report on the experimental generation of brilliant gamma-ray beams with not only high photon yield but also low divergence, based on picosecond laser-accelerated electrons. The 120 J 1 ps laser pulse drives self-modulated wakefield acceleration in a high-density gas jet and generates tens-of-MeV electrons with 26 nC and divergence as small as $1.51{}^{circ}$ . These collimated electrons produce gamma-ray photons through bremsstrahlung radiation when transversing a high-Z solid target. We design a high-energy-resolution Compton-scattering spectrometer and find that a total photon number of $2.2times {10}^9$ is captured within an acceptance angle of $1.1{}^{circ}$ for photon energies up to $16;mathrm{MeV}$ . Comparison between the experimental results and Monte Carlo simulations illustrates that the photon beam inherits the small divergence from electrons, corresponding to a total photon number of $2.2times {10}^{11}$ and a divergence of $7.73{}^{circ}$ .
{"title":"Collimated gamma beams with high peak flux driven by laser-accelerated electrons","authors":"L. Fan, Tongjun Xu, Shun Li, Zhangli Xu, Jiancai Xu, Jianqiang Zhu, B. Shen, L. Ji","doi":"10.1017/hpl.2023.25","DOIUrl":"https://doi.org/10.1017/hpl.2023.25","url":null,"abstract":"Abstract Laser-accelerated electrons are promising in producing gamma-photon beams of high peak flux for the study of nuclear photonics, obtaining copious positrons and exploring photon–photon interaction in vacuum. We report on the experimental generation of brilliant gamma-ray beams with not only high photon yield but also low divergence, based on picosecond laser-accelerated electrons. The 120 J 1 ps laser pulse drives self-modulated wakefield acceleration in a high-density gas jet and generates tens-of-MeV electrons with 26 nC and divergence as small as \u0000$1.51{}^{circ}$\u0000 . These collimated electrons produce gamma-ray photons through bremsstrahlung radiation when transversing a high-Z solid target. We design a high-energy-resolution Compton-scattering spectrometer and find that a total photon number of \u0000$2.2times {10}^9$\u0000 is captured within an acceptance angle of \u0000$1.1{}^{circ}$\u0000 for photon energies up to \u0000$16;mathrm{MeV}$\u0000 . Comparison between the experimental results and Monte Carlo simulations illustrates that the photon beam inherits the small divergence from electrons, corresponding to a total photon number of \u0000$2.2times {10}^{11}$\u0000 and a divergence of \u0000$7.73{}^{circ}$\u0000 .","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"12 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79994305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract We present a compact and cost-effective mJ-level femtosecond laser system operating at a center wavelength of approximately 2.15 μm. An affordable two-stage ytterbium-doped yttrium aluminum garnet (Yb:YAG) chirped pulse amplifier provides more than 10 mJ, approximately 1.2 ps pulses at 1030 nm to pump a three-stage optical parametric chirped pulse amplifier (OPCPA) based on bismuth borate crystals and to drive the supercontinuum seed in the YAG crystal. The energy of the amplified pulses in the wavelength range of 1.95–2.4 μm reached 2.25 mJ with a pump-to-signal conversion efficiency of approximately 25% in the last OPCPA stage. These pulses were compressed to 38 fs in a pair of Suprasil 300 glass prisms.
{"title":"High-efficiency bismuth borate-based optical parametric chirped pulse amplifier with approximately 2.1 mJ, 38 fs output pulses at approximately 2150 nm","authors":"A. Petrulėnas, P. Mackonis, A. Rodin","doi":"10.1017/hpl.2023.24","DOIUrl":"https://doi.org/10.1017/hpl.2023.24","url":null,"abstract":"Abstract We present a compact and cost-effective mJ-level femtosecond laser system operating at a center wavelength of approximately 2.15 μm. An affordable two-stage ytterbium-doped yttrium aluminum garnet (Yb:YAG) chirped pulse amplifier provides more than 10 mJ, approximately 1.2 ps pulses at 1030 nm to pump a three-stage optical parametric chirped pulse amplifier (OPCPA) based on bismuth borate crystals and to drive the supercontinuum seed in the YAG crystal. The energy of the amplified pulses in the wavelength range of 1.95–2.4 μm reached 2.25 mJ with a pump-to-signal conversion efficiency of approximately 25% in the last OPCPA stage. These pulses were compressed to 38 fs in a pair of Suprasil 300 glass prisms.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"31 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75415952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kangnan Jiang, K. Feng, Hao Wang, Xiaojun Yang, P. Bai, Yi Xu, Y. Leng, Wentao Wang, Ruxin Li
Abstract A single-shot measurement of electron emittance was experimentally accomplished using a focused transfer line with a dipole. The betatron phase of electrons based on laser wakefield acceleration (LWFA) is energy dependent owing to the coupling of the longitudinal acceleration field and the transverse focusing (defocusing) field in the bubble. The phase space presents slice information after phase compensation relative to the center energy. Fitting the transverse size of the electron beam at different energy slices in the energy spectrum measured 0.27 mm mrad in the experiment. The diagnosis of slice emittance facilitates local electron quality manipulation, which is important for the development of LWFA-based free electron lasers. The quasi-3D particle-in-cell simulations matched the experimental results and analysis well.
摘要利用偶极子聚焦传输线实现了电子发射度的单次测量。由于气泡中纵向加速场和横向聚焦(散焦)场的耦合作用，基于激光尾流场加速(LWFA)的电子的betatron相位是能量依赖的。相对于中心能量，相位补偿后的相空间呈现出切片信息。在实验测得的0.27 mm mrad能谱中，拟合了电子束在不同能量片上的横向尺寸。薄片发射度的诊断有助于局部电子质量的控制，这对基于lwfa的自由电子激光器的发展具有重要意义。准三维细胞内粒子模拟结果与实验结果和分析结果吻合较好。
{"title":"Measurement of electron beam transverse slice emittance using a focused beamline","authors":"Kangnan Jiang, K. Feng, Hao Wang, Xiaojun Yang, P. Bai, Yi Xu, Y. Leng, Wentao Wang, Ruxin Li","doi":"10.1017/hpl.2023.9","DOIUrl":"https://doi.org/10.1017/hpl.2023.9","url":null,"abstract":"Abstract A single-shot measurement of electron emittance was experimentally accomplished using a focused transfer line with a dipole. The betatron phase of electrons based on laser wakefield acceleration (LWFA) is energy dependent owing to the coupling of the longitudinal acceleration field and the transverse focusing (defocusing) field in the bubble. The phase space presents slice information after phase compensation relative to the center energy. Fitting the transverse size of the electron beam at different energy slices in the energy spectrum measured 0.27 mm mrad in the experiment. The diagnosis of slice emittance facilitates local electron quality manipulation, which is important for the development of LWFA-based free electron lasers. The quasi-3D particle-in-cell simulations matched the experimental results and analysis well.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"3 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80955190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zilin Zhao, D. Luo, Yang Liu, Zejiang Deng, Lian Zhou, Gehui Xie, Chenglin Gu, Yanzhao Yang, Bin Wu, Wenxue Li
Abstract We report a compact, tunable, self-starting, all-fiber laser-based asynchronous optical sampling (ASOPS) system. Two Er-doped fiber oscillators were used as the pulsed-laser source, whose repetition rate could be set at 100 MHz with a tuning range of 1.25 MHz through a fiber delay line. By employing phase-locked and temperature control loops, the repetition rate offset of the two lasers was stabilized with 7.13 × 10−11 fractional instability at an average time of 1 s. Its capabilities in the terahertz regime were demonstrated by terahertz time-domain spectroscopy, achieving a spectral bandwidth of 3 THz with a dynamic range of 30 dB. The large range of repetition rate adjustment in our ASOPS system has the potential to be a powerful tool in the terahertz regime.
{"title":"Tunable compact asynchronous optical sampling system using Er-doped fiber laser","authors":"Zilin Zhao, D. Luo, Yang Liu, Zejiang Deng, Lian Zhou, Gehui Xie, Chenglin Gu, Yanzhao Yang, Bin Wu, Wenxue Li","doi":"10.1017/hpl.2023.21","DOIUrl":"https://doi.org/10.1017/hpl.2023.21","url":null,"abstract":"Abstract We report a compact, tunable, self-starting, all-fiber laser-based asynchronous optical sampling (ASOPS) system. Two Er-doped fiber oscillators were used as the pulsed-laser source, whose repetition rate could be set at 100 MHz with a tuning range of 1.25 MHz through a fiber delay line. By employing phase-locked and temperature control loops, the repetition rate offset of the two lasers was stabilized with 7.13 × 10−11 fractional instability at an average time of 1 s. Its capabilities in the terahertz regime were demonstrated by terahertz time-domain spectroscopy, achieving a spectral bandwidth of 3 THz with a dynamic range of 30 dB. The large range of repetition rate adjustment in our ASOPS system has the potential to be a powerful tool in the terahertz regime.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"41 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89780966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ning Wen, Nan Wang, N. Zong, Xuechun Lin, Hong-wei Gao, Yong Bo, Q. Peng, D. Cui, Zu-Yan Xu
Abstract We present a high-energy, hundred-picosecond (ps) pulsed mid-ultraviolet solid-state laser at 266 nm by a direct second harmonic generation (SHG) in a barium borate (BaB2O4, BBO) nonlinear crystal. The green pump source is a 710 mJ, 330 ps pulsed laser at a wavelength of 532 nm with a repetition rate of 1 Hz. Under a green pump energy of 710 mJ, a maximum output energy of 253.3 mJ at 266 nm is achieved with 250 ps pulse duration resulting in a peak power of more than 1 GW, corresponding to an SHG conversion efficiency of 35.7% from 532 to 266 nm. The experimental data were well consistent with the theoretical prediction. To the best of our knowledge, this laser exhibits both the highest output energy and highest peak power ever achieved in a hundred-ps/ps regime at 266 nm for BBO-SHG.
{"title":"High-energy, hundred-picosecond pulsed 266 nm mid-ultraviolet generation by a barium borate crystal","authors":"Ning Wen, Nan Wang, N. Zong, Xuechun Lin, Hong-wei Gao, Yong Bo, Q. Peng, D. Cui, Zu-Yan Xu","doi":"10.1017/hpl.2023.22","DOIUrl":"https://doi.org/10.1017/hpl.2023.22","url":null,"abstract":"Abstract We present a high-energy, hundred-picosecond (ps) pulsed mid-ultraviolet solid-state laser at 266 nm by a direct second harmonic generation (SHG) in a barium borate (BaB2O4, BBO) nonlinear crystal. The green pump source is a 710 mJ, 330 ps pulsed laser at a wavelength of 532 nm with a repetition rate of 1 Hz. Under a green pump energy of 710 mJ, a maximum output energy of 253.3 mJ at 266 nm is achieved with 250 ps pulse duration resulting in a peak power of more than 1 GW, corresponding to an SHG conversion efficiency of 35.7% from 532 to 266 nm. The experimental data were well consistent with the theoretical prediction. To the best of our knowledge, this laser exhibits both the highest output energy and highest peak power ever achieved in a hundred-ps/ps regime at 266 nm for BBO-SHG.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"38 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87079122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Prasselsperger, F. Balling, H. Wieser, K. Parodi, J. Schreiber
Abstract Characterizing exact energy density distributions for laser-accelerated ion bunches in a medium is challenging due to very high beam intensities and the electro-magnetic pulse emitted in the laser–plasma interaction. Ion-bunch energy acoustic tracing allows for reconstructing the spatial energy density from the ionoacoustic wave generated upon impact in water. We have extended this approach to tracing ionoacoustic modulations of broad energy distributions by introducing thin foils in the water reservoir to shape the acoustic waves at distinct points along the depth–dose curve. Here, we present first simulation studies of this new detector and reconstruction approach, which provides an online read-out of the deposited energy with depth within the centimeter range behind the ion source of state-of-the-art laser–plasma-based accelerators.
{"title":"Ion-bunch energy acoustic tracing by modulation of the depth-dose curve","authors":"A. Prasselsperger, F. Balling, H. Wieser, K. Parodi, J. Schreiber","doi":"10.1017/hpl.2023.18","DOIUrl":"https://doi.org/10.1017/hpl.2023.18","url":null,"abstract":"Abstract Characterizing exact energy density distributions for laser-accelerated ion bunches in a medium is challenging due to very high beam intensities and the electro-magnetic pulse emitted in the laser–plasma interaction. Ion-bunch energy acoustic tracing allows for reconstructing the spatial energy density from the ionoacoustic wave generated upon impact in water. We have extended this approach to tracing ionoacoustic modulations of broad energy distributions by introducing thin foils in the water reservoir to shape the acoustic waves at distinct points along the depth–dose curve. Here, we present first simulation studies of this new detector and reconstruction approach, which provides an online read-out of the deposited energy with depth within the centimeter range behind the ion source of state-of-the-art laser–plasma-based accelerators.","PeriodicalId":54285,"journal":{"name":"High Power Laser Science and Engineering","volume":"167 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76455716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：