Yang Shunhua, Liang Xiao, Xie Xinglong, Yang Qingwei, Tu Xiaoniu, Zheng Yanqing, Zhang Xiaoqi, Zhang Yan, Guo Ailin, Zhu Ping, Kang Jun, Sun Meizhi, Zhu Jianqiang
Opt Express. 2020 Apr 13;28(8):11645-11651. doi: 10.1364/OE.385790.
We present a high efficiency and ultra-broadband optical parametric chirped-pulse amplification (OPCPA) system fully based on yttrium calcium oxyborate (YCOB) crystals. The OPCPA properties of YCOB at 808 nm are studied for both high gain and saturated amplification. The non-collinear angle is finely tuned to study the variation of gain spectrum at a certain phase-matching angle of YCOB crystals. After amplification by four YCOB crystals, a total signal gain of 0.9×10 is obtained and the FWHM spectral bandwidth is still over 100 nm. An amplified signal pulse of 182 mJ is achieved with pump energy of 440 mJ in the saturated amplification stage and the conversion efficiency is about 40%. After a four-grating compressor, a pulse duration of 20 fs is measured by a second-order autocorrelator.
我们展示了一种完全基于硼酸钇钙（YCOB）晶体的高效超宽带光学参量啁啾脉冲放大（OPCPA）系统。研究了YCOB在808 nm处的OPCPA特性，包括高增益和饱和放大。精细调整非共线角度，以研究在YCOB晶体特定相位匹配角度下增益谱的变化。经过四块YCOB晶体放大后，获得了0.9×10的总信号增益，半高全宽光谱带宽仍超过100 nm。在饱和放大阶段，泵浦能量为440 mJ时，获得了182 mJ的放大信号脉冲，转换效率约为40%。经过四级光栅压缩器后，用二阶自相关仪测量得到脉冲持续时间为20 fs。
