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

  • Jianqiang Zhu (a1) (a2), Xinglong Xie (a1) (a2), Meizhi Sun (a1) (a2), Jun Kang (a1) (a2), Qingwei Yang (a1) (a2), Ailin Guo (a1) (a2), Haidong Zhu (a1) (a2), Ping Zhu (a1) (a2), Qi Gao (a1) (a2), Xiao Liang (a1) (a2) (a3), Ziruo Cui (a1) (a2) (a3), Shunhua Yang (a1) (a2) (a3), Cheng Zhang (a1) (a2) (a3) and Zunqi Lin (a1) (a2)...


We present a recent progress of the SG-II 5PW 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 7th 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 ${\sim}10~\unicode[STIX]{x03BC}\text{m}$ after the closed-loop corrections by the adaptive optics. Limited by the repetition of the pump laser, the SG-II 5PW facility operates one shot per hour. It has successfully been employed for high energy physics experiments.

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This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (, which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Correspondence to: X. Xie and M. Sun, 390 Qinghe Road, Jiading, Shanghai 201800, China. Email: (X. Xie), (M. Sun)


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