title: Optimization for high-energy and high-efficiency broadband optical parametric chirped-pulse amplification in LBO near 800  nm.
abstract: In this Letter, we present a study of high-energy and high-conversion-efficiency broadband optical parametric chirped-pulse amplification (OPCPA) system with a 100  mm×100  mm×17  mm LBO crystal near 800 nm. The results showed that the back-conversion was sensitively affected by the pump intensity and the injected signal intensity. It occurred when the injected signal was above 0.82 J with a pump energy of 170 J, and this effect also reshaped the amplified spectrum. After optimization, an amplified energy of 45.3 J was achieved with a conversion efficiency of 26.3% by the OPCPA. The peak power of the hybrid CPA-OPCPA laser system reached 1.02 PW with a compressed duration of 32 fs, which is the first reported OPCPA peak power higher than 1 PW, to the best of our knowledge.
authors.forename: Lianghong
authors.initials: L
authors.lastname: Yu
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Liang
authors.forename: Lu
authors.initials: L
authors.lastname: Xu
authors.forename: Wenqi
authors.initials: W
authors.lastname: Li
authors.forename: Chun
authors.initials: C
authors.lastname: Peng
authors.forename: Zhanggui
authors.initials: Z
authors.lastname: Hu
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Lu
authors.forename: Yuxi
authors.initials: Y
authors.lastname: Chu
authors.forename: Zebiao
authors.initials: Z
authors.lastname: Gan
authors.forename: Xiaodi
authors.initials: X
authors.lastname: Liu
authors.forename: Yanqi
authors.initials: Y
authors.lastname: Liu
authors.forename: Xinliang
authors.initials: X
authors.lastname: Wang
authors.forename: Haihe
authors.initials: H
authors.lastname: Lu
authors.forename: Dingjun
authors.initials: D
authors.lastname: Yin
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Leng
authors.forename: Ruxin
authors.initials: R
authors.lastname: Li
authors.forename: Zhizhan
authors.initials: Z
authors.lastname: Xu