摘要
在啁啾脉冲放大(CPA)系统中,时域展宽器与压缩器的匹配是获得高对比度飞秒脉冲的关键。相比较常规的Martinez和Offner结构的展宽器,基于同心结构的展宽器由于物与像完全重合,可以消除像差带来的高阶色散的影响,进而采用光栅对压缩器以获得更好的压缩效果。透射光栅对和凹面反射镜组合实现的同心展宽器具有结构紧凑的优点,将该展宽器替代原有的Martinez型展宽器,在重复频率为1 k Hz、泵浦功率为11.4 W的泵浦条件下,展宽后的啁啾脉冲经环形腔钛宝石再生放大器进行能量放大,再由光栅对进行压缩,可获得脉冲宽度为47.5 fs的压缩结果,接近于光谱带宽22.1 nm的傅里叶变换极限。该结果表明基于透射光栅的同心展宽器可以获得较好的飞秒脉冲压缩效果。
The matching of time domain stretcher and compressor is the key to obtain high contrast femtosecond pulse in chirped-pulse amplification(CPA) laser system. Compared with the conventional Martinez type stretcher and Offner type stretcher, the stretcher based on concentric structure can eliminate the effect of higher-order dispersion induced by aberration due to the fact that the object is completely coincident with the image, and can further realize better pulse compression with double grating compressor.The concentric stretcher, which consists of a transmission grating pair and a concave mirror, has the advantage of compact structure. Replacing the original Martinez stretcher with the concentric stretcher,under the condition of 1 k Hz repetition rate and 11.4 W pump power, the stretched chirped pulse is amplified by the ring-cavity Ti: Sapphire regenerative amplifier and then compressed by the grating pair compressor. The compression result with pulse duration of 47.5 fs is obtained, which is close to the Fourier transform limit of spectral bandwidth of 22.1 nm. The results show that the concentric stretcher based on transmission grating can achieve better compression result for femtosecond pulse.
作者
杨浩
滕浩
吕仁冲
朱江峰
魏志义
YANG Hao;TENG Hao;LYU Renchong;ZHU Jiangfeng;WEI Zhiyi(School of Physics and Optoelectronic Engineering,Xidian University,Xi’an 710126,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)
出处
《量子电子学报》
CAS
CSCD
北大核心
2022年第4期566-573,共8页
Chinese Journal of Quantum Electronics
基金
国家自然科学基金(12034020,11774277)
国家重点研发计划项目(2018YFB1107201)
(综合极端条件实验装置)。
关键词
激光技术
飞秒激光
啁啾脉冲放大
脉冲展宽器
再生放大器
laser techniques
femtosecond laser
chirped-pulse amplification
pulse stretcher
regenerative amplifier
