摘要
在皮秒短脉冲泵浦的光参量啁啾脉冲放大(ps-OPCPA)系统中,泵浦光与信号光之间的高精度时间同步是需要解决的关键问题之一.本文基于中国工程物理研究院激光聚变研究中心的全OPCPA激光装置,对用于前端ps-OPCPA中泵浦光与信号光的高精度同步主动控制技术进行了详细研究.采用大啁啾信号光窄光谱光参量放大的主动反馈方式,通过合理设计反馈光路信号光的时域展宽啁啾系数,将泵浦光与信号光的同步时间抖动从ps量级降低至百fs量级的时间范围,从而极大地改善了前端ps-OPCPA的能量和光谱不稳定性:7 min测试时间内泵浦光与信号光相对同步时间抖动的均方根值(RMS)从458 fs改善至93 fs,输出能量RMS不稳定性从30.3%改善至3.15%,且维持光谱宽度大于100 nm的稳定宽光谱输出.
High-precision synchronization between pump and signal is one of the key issues that should be solved in picosecond short pulse pumped optical parametric chirped pulse amplification(ps-OPCPA).Based on the allOPCPA laser facility in Research Center of Laser Fusion,China Academy of Engineering Physics,the highprecision active pump-signal synchronization technique used in its ps-OPCPA frontend is studied in detail in this paper.The synchronization is actively controlled by an amplified narrowband spectrum from the short pspulse pumped optical parametric amplification of a large chirped signal.By reasonably designing the timedomain broadening chirped coefficient of the signal in the feedback optical path,relative timing jitter between pump and signal of the ps-OPCPA frontend decreases from ps to one hundred fs,which greatly improves its energy and spectral stability.The root mean square(RMS)value of the relative timing jitter decreases from 458 to 93 fs,which improves the RMS instability of the output energy from 30.3%to 3.15%,and a stable wide spectrum with width greater than 100 nm is obtained in 7-min measurement.
作者
李纲
郭仪
曾小明
谢娜
邵忠喜
黄征
孙立
蒋东镔
卢峰
朱斌
周凯南
粟敬钦
Li Gang;Guo Yi;Zeng Xiao-Ming;Xie Na;Shao Zhong-Xi;Huang Zheng;Sun Li;Jiang Dong-Bin;Lu Feng;Zhu Bin;Zhou Kai-Nan;Su Jing-Qin(Science and Technology on Plasma Physics Laboratory,Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China;School of Mechatronics Engineering,Harbin Insititute of Technology,Harbin 150001,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第7期137-146,共10页
Acta Physica Sinica
基金
中国工程物理研究院国防科技等离子体物理重点实验室研究基金(批准号:ZY2020-07)、中国工程物理研究院创新发展基金(批准号:CX20200022)
国家自然科学基金委员会-中国工程物理研究院NSAF联合基金(批准号:U1930126)资助的课题。
关键词
光参量啁啾脉冲放大
皮秒泵浦脉冲
高精度同步
optical parametric chirped pulse amplification
picosecond pump pulse
high-precision synchronization
