基于两级固体薄片组的飞秒脉冲压缩技术  

Femtosecond pulse compression technology based on two-stage solid thin-film assemblies

作　　者：朱光毅 金尚忠 吴磊[2] 张国栋 莫云龙 尤越 薛媛元[2] 张云龙[2] 俞兵[2] 董再天 ZHU Guangyi;JIN Shangzhong;WU Lei;ZHANG Guodong;MO Yunlong;YOU Yue;XUE Yuanyuan;ZHANG Yunlong;YU Bing;DONG Zaitian(College of Optical and Electronic Science Technology,China Jiliang University,Hangzhou 310018,China;Xi'an Institute of Applied Optics,Xi'an 710065,China;Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]中国计量大学光学与电子科技学院,浙江杭州310018 [2]西安应用光学研究所,陕西西安710065 [3]西北工业大学,陕西西安710072

出　　处：《应用光学》2025年第2期427-434,共8页Journal of Applied Optics

基　　金：科工局技术基础科研项目(JSJL2019208C002)。

摘　　要：少周期飞秒激光脉冲的产生通常是采用空芯光纤或非线性固体介质对几十飞秒的激光脉冲进行扩谱、压缩。然而,目前稳定性高、价格相对低廉的工业飞秒激光器的脉宽普遍处于百飞秒量级,因此,开展百飞秒激光脉冲的扩谱、压缩具有重要的现实意义。以脉冲宽度为145 fs的钛宝石激光为研究对象,利用固体薄片组和啁啾镜对其进行两级扩谱与脉宽压缩,采用瞬态光栅频率分辨光开关法进行脉冲波形和脉冲宽度测量。成功获得了7.5 fs的激光脉冲输出,压缩倍率达到19倍,能量转换效率>81%,压缩前后的脉冲宽度测量重复性分别为2.4%和3.4%。研究结果可为百飞秒工业飞秒激光器向少周期飞秒激光的压缩提供借鉴思路。The generation of sub-cycle femtosecond laser pulses is usually achieved by spectral broadening and compression of tens of femtosecond laser pulses using hollow-core fibers or nonlinear solid-state media.However,the current industrial femtosecond laser sources with high stability and relatively low cost typically have pulse durations in the hundreds of femtoseconds range.Therefore,the spectral broadening and compression of hundred-femtosecond laser pulses have great practical significance.A titanium sapphire laser with a pulse width of 145 fs was focused,and the two-stage spectral broadening and pulse width compression were achieved using solid thin-film assemblies and chirped mirrors.Pulse waveform and pulse width measurements were conducted using transient grating frequency-resolved optical gating(TG-FROG)method.Ultimately,a laser pulse output with a duration of 7.5 fs was successfully obtained,achieving a compression factor of 19,with an energy conversion efficiency exceeding 81%.The repeatability of pulse width measurements before and after compression is 2.4%and 3.4%,respectively.The research results provide reference ideas for the compression of hundred-femtosecond industrial femtosecond laser sources towards sub-cycle femtosecond lasers.

关 键 词：飞秒激光 固体薄片 脉宽压缩 光谱展宽 脉冲测量 

分 类 号：TN249[电子电信—物理电子学]