We demonstrated a scheme of bandwidth expansion and pulse shape optimized to afford 10 PW laser design via spec-tral shaping,which uses the existing Nd:glass amplifier chain of the SG PW laser.Compared to the amplifie...We demonstrated a scheme of bandwidth expansion and pulse shape optimized to afford 10 PW laser design via spec-tral shaping,which uses the existing Nd:glass amplifier chain of the SG PW laser.Compared to the amplified pulse with a gain-narrowing effect,the required parameters of injected pulse energy,spectral bandwidth,and shape are analyzed,to-gether with their influence on the system B-integral,energy output capability,and temporal intensity contrast.A bandwidth expansion to 7 nm by using LiNbO_(3) birefringent spectral shaping resulted in an output energy of 2 kJ in a proof-of-principle experiment.The results are consistent with the theoretical prediction which suggests that the amplifier chain of SG PW laser is capable of achieving 6 kJ at the bandwidth of 7 nm and the B-integral<π.This will support a 10 PW laser with a compressed pulse energy of 4.8 kJ(efficiency=80%)at 480 fs.展开更多
The betatron radiation source features a micrometer-scale source size,a femtosecond-scale pulse duration,milliradianlevel divergence angles and a broad spectrum exceeding tens of keV.It is conducive to the high-contra...The betatron radiation source features a micrometer-scale source size,a femtosecond-scale pulse duration,milliradianlevel divergence angles and a broad spectrum exceeding tens of keV.It is conducive to the high-contrast imaging of minute structures and for investigating interdisciplinary ultrafast processes.In this study,we present a betatron X-ray source derived from a high-charge,high-energy electron beam through a laser wakefield accelerator driven by the 1 PW/0.1 Hz laser system at the Shanghai Superintense Ultrafast Laser Facility(SULF).The critical energy of the betatron X-ray source is 22±5 keV.The maximum X-ray flux reaches up to 4×10^(9)photons for each shot in the spectral range of 5-30 keV.Correspondingly,the experiment demonstrates a peak brightness of 1.0×10^(23)photons·s^(-1)·mm^(-2)·mrad^(-2)·0.1%BW^(-1),comparable to those demonstrated by third-generation synchrotron light sources.In addition,the imaging capability of the betatron X-ray source is validated.This study lays the foundation for future imaging applications.展开更多
We report dispersion management based on a mismatched-grating compressor for a 100 PW level laser,which utilizes optical parametric chirped pulse amplification and also features large chirped pulse duration and an ult...We report dispersion management based on a mismatched-grating compressor for a 100 PW level laser,which utilizes optical parametric chirped pulse amplification and also features large chirped pulse duration and an ultra-broadband spectrum.The numerical calculation indicates that amplified pulses with 4 ns chirped pulse duration and 210 nm spectral bandwidth can be directly compressed to sub-13 fs,which is close to the Fourier-transform limit(FTL).More importantly,the tolerances of the mismatched-grating compressor to the misalignment of the stretcher,the error of the desired grating groove density and the variation of material dispersion are comprehensively analyzed,which is crucially important for its practical application.The results demonstrate that good tolerances and near-FTL compressed pulses can be achieved simultaneously,just by keeping a balance between the residual second-,third-and fourth-order dispersions in the laser system.This work can offer a meaningful guideline for the design and construction of 100 PW level lasers.展开更多
基金Projectsupported by the International Partnership Program of Chinese Academy of Sciences(Grant No.181231KYSB20170022)the Natural Science Foundation of Jiangsu Higher Education Institutions of China(Grant No.20KJB140020).
文摘We demonstrated a scheme of bandwidth expansion and pulse shape optimized to afford 10 PW laser design via spec-tral shaping,which uses the existing Nd:glass amplifier chain of the SG PW laser.Compared to the amplified pulse with a gain-narrowing effect,the required parameters of injected pulse energy,spectral bandwidth,and shape are analyzed,to-gether with their influence on the system B-integral,energy output capability,and temporal intensity contrast.A bandwidth expansion to 7 nm by using LiNbO_(3) birefringent spectral shaping resulted in an output energy of 2 kJ in a proof-of-principle experiment.The results are consistent with the theoretical prediction which suggests that the amplifier chain of SG PW laser is capable of achieving 6 kJ at the bandwidth of 7 nm and the B-integral<π.This will support a 10 PW laser with a compressed pulse energy of 4.8 kJ(efficiency=80%)at 480 fs.
基金supported by the National Natural Science Foundation of China(Grant Nos.12388102,12225411,12105353 and 12174410)the CAS Project for Young Scientists in Basic Research(Grant No.YSBR060)+3 种基金the Program of Shanghai Academic Research Leader(Grant No.22XD1424200)the State Key Laboratory Program of the Chinese Ministry of Science and Technologythe CAS Youth Innovation Promotion Association(Grant No.2022242)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB0890201 and XDB0890202)。
文摘The betatron radiation source features a micrometer-scale source size,a femtosecond-scale pulse duration,milliradianlevel divergence angles and a broad spectrum exceeding tens of keV.It is conducive to the high-contrast imaging of minute structures and for investigating interdisciplinary ultrafast processes.In this study,we present a betatron X-ray source derived from a high-charge,high-energy electron beam through a laser wakefield accelerator driven by the 1 PW/0.1 Hz laser system at the Shanghai Superintense Ultrafast Laser Facility(SULF).The critical energy of the betatron X-ray source is 22±5 keV.The maximum X-ray flux reaches up to 4×10^(9)photons for each shot in the spectral range of 5-30 keV.Correspondingly,the experiment demonstrates a peak brightness of 1.0×10^(23)photons·s^(-1)·mm^(-2)·mrad^(-2)·0.1%BW^(-1),comparable to those demonstrated by third-generation synchrotron light sources.In addition,the imaging capability of the betatron X-ray source is validated.This study lays the foundation for future imaging applications.
基金supported by the National Natural Science Foundation of China (61925507)National Key R&D Program of China (2017YFE0123700)+6 种基金Strategic Priority Research Program of Chinese Academy of Sciences (XDB1603)Shanghai Municipal Science and Technology Major Project (2017SHZDZX02)Shanghai Natural Science Foundation (20ZR1464600)Program of Shanghai Academic/Technology Research Leader (18XD1404200)Shanghai Sailing Program (21YF1453800)International Partnership Program of Chinese Academy of Sciences (181231KYSB20200040)Youth Innovation Promotion Association of CAS。
文摘We report dispersion management based on a mismatched-grating compressor for a 100 PW level laser,which utilizes optical parametric chirped pulse amplification and also features large chirped pulse duration and an ultra-broadband spectrum.The numerical calculation indicates that amplified pulses with 4 ns chirped pulse duration and 210 nm spectral bandwidth can be directly compressed to sub-13 fs,which is close to the Fourier-transform limit(FTL).More importantly,the tolerances of the mismatched-grating compressor to the misalignment of the stretcher,the error of the desired grating groove density and the variation of material dispersion are comprehensively analyzed,which is crucially important for its practical application.The results demonstrate that good tolerances and near-FTL compressed pulses can be achieved simultaneously,just by keeping a balance between the residual second-,third-and fourth-order dispersions in the laser system.This work can offer a meaningful guideline for the design and construction of 100 PW level lasers.
