Analysis and construction status of SG-II 5PW laser facility. (1st June 2018)

• Record Type: Journal Article
• Authors: Zhu, Jianqiang; Xie, Xinglong; Sun, Meizhi; Kang, Jun; Yang, Qingwei; Guo, Ailin; Zhu, Haidong; Zhu, Ping; Gao, Qi; Liang, Xiao; Cui, Ziruo; Yang, Shunhua; Zhang, Cheng; Lin, Zunqi
• Is Part Of: High power laser science and engineering. Volume 6(2018)
• Publication Date: 2018-06-01
• Subjects: conversion efficiency, -- multi-petawatt, -- optical parametric amplification, -- proton acceleration, -- ultrashort pulse; High power lasers -- Periodicals; 621.366
• DOI: 10.1017/hpl.2018.23
• Languages: English
• ISSNs: 2095-4719

Abstract

Abstract : 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.