Analysis and construction status of SG-Ⅱ 5PW laser facility

作者：Jianqiang Zhu; Xinglong Xie^*; Meizhi Sun^*; Jun Kang; Qingwei Yang; Ailin Guo; Haidong Zhu; Ping Zhu; Qi Gao; Xiao Liang; Ziruo Cui; Shunhua Yang; Cheng Zhang; Zunqi Lin

来源：High Power Laser Science and Engineering, 2018, 6(02): 115-127.

We present a recent progress of the SG-II 5 PW facility, which designed a multi-petawatt ultrashort pulse laser based on optical parametric chirped-pulse amplification(OPCPA). The prior two optical parametric amplifiers have been accomplished and chirped pulses with an energy of 49.7 J and a full-width-at-half-maximum(FWHM) spectrum bandwidth of 85 nm have been achieved. In the PW-scale optical parametric amplification(OPA), with the pump pulse that has an energy of 118 J from the second harmonic generation of the SG-II 7 th beam, the pump-to-signal conversion efficiency is up to 41.9%, which to the best of our knowledge is the highest among all of the reported values for OPCPA systems. The compressed pulse is higher than 37 J in 21 fs(1.76 PW), and the focal spot is ～10 μm after the closed-loop corrections by the adaptive optics. Limited by the repetition of the pump laser, the SG-II 5 PW facility operates one shot per hour. It has successfully been employed for high energy physics experiments.

• 出版日期2018
• 单位中国科学院大学