Choi Il Woo, Jeon Cheonha, Lee Seong Geun, Kim Seung Yeon, Kim Tae Yun, Kim I Jong, Lee Hwang Woon, Woo Yoon Jin, Sung Jae Hee, Lee Seong Ku, Nam Chang Hee
Opt Lett. 2020 Dec 1;45(23):6342-6345. doi: 10.1364/OL.409749.
We present a highly efficient double plasma mirror (DPM) that provides ultrahigh-contrast multi-petawatt (PW) laser pulses with a temporal contrast ratio reaching 10 up to 160 ps and 10 up to 2 ps before the main pulse. The high reflectivity of 70%, along with the high-contrast enhancement factor of 700,000, was achieved from the DPM installed after the final stage of a 4 PW Ti:sapphire laser. The 4 PW laser was equipped with cross-polarized wave generation and optical parametric chirped-pulse amplification stages for initial high-contrast operation. The DPM operation was undertaken with conditions that did not modify the spatiotemporal profiles of incident multi-PW laser pulses. This highly efficient DPM with the high-contrast enhancement promises the utilization of multiple PMs as a practical rear end for upcoming tens of petawatt lasers to achieve ultrahigh temporal contrast.
我们展示了一种高效的双等离子体镜（DPM），它能提供超高对比度的多拍瓦（PW）激光脉冲，在主脉冲前160皮秒内时间对比度达到10 ，在主脉冲前2皮秒内时间对比度达到10 。在一台4拍瓦钛宝石激光器的末级之后安装的DPM实现了70%的高反射率以及700,000的高对比度增强因子。这台4拍瓦激光器配备了交叉偏振波产生和光学参量啁啾脉冲放大级，用于初始的高对比度运行。DPM的运行条件不会改变入射多拍瓦激光脉冲的时空分布。这种具有高对比度增强功能的高效DPM有望将多个等离子体镜用作即将到来的数十拍瓦激光器的实用后端，以实现超高的时间对比度。
