基于脉冲非线性压缩技术的71.3 W飞秒激光产生  

Pulse nonlinear compression generated 71.3 W femtosecond laser

作　　者：张旭[1,2] 王兆华 王羡之[1] 李佳文 李佳俊 赵国栋 魏志义 Zhang Xu;Wang Zhao-Hua;Wang Xian-Zhi;Li Jia-Wen;Li Jia-Jun;Zhao Guo-Dong;Wei Zhi-Yi(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 Sciences,Beijing 100049,China;Songshan Lake Material Laboratory,Dongguan 523808,China)

机构地区：[1]中国科学院物理研究所,北京凝聚态物理国家实验室,北京100190 [2]中国科学院大学物理学院,北京100049 [3]松山湖材料实验室,东莞523808

出　　处：《物理学报》2023年第14期116-122,共7页Acta Physica Sinica

基　　金：中国科学院稳定支持基础研究领域青年团队计划(批准号:YSBR-065);中国科学院战略性先导科技专项(批准号:XDB16030200)资助的课题;国家自然科学基金(批准号:11774410)。

摘　　要：采用了Herriott型多通腔对高平均功率皮秒激光进行非线性压缩产生飞秒激光的脉冲宽度压缩系统,并通过ABCD矩阵对腔内本征模式分布进行了求解计算.实验上通过利用多通腔脉冲压缩装置将100 W钕离子激光器输出的脉冲光谱宽度从0.20 nm展宽到2.75 nm,光谱展宽比为13.75,B积分累积总量接近15.6.利用透射光栅将补偿色散后脉冲宽度从12.5 ps压缩到了780 fs,脉冲压缩比为16,最终输出功率为71.3 W,装置整体效率为71.3%.该装置提供了一种更加结构简单,成本廉价的高平均功率飞秒激光产生方式.The power of femtosecond lasers based on Ti:sapphire or Yb-doped gain media has reached a high level by using chirped pulse amplification.The dispersive elements are normally employed in CPA devices,thereby increasing the complexity and cost of the laser system.However,for the Nd-doped laser,its power can be amplified to hundreds of microjoules or even several millijoules directly without CPA technology.So compressing the picosecond pulse to obtain femtosecond laser pulses with hundreds of microjoules pulse energy by post-compression technology becomes meaningful.The pulsed post-compression technology is the combination of nonlinear spectral broadening and dispersion compensation.Currently,the most effective method of nonlinear spectral broadening is achieved through self-phase modulation.The multi-pass cell(MPC)device based on self-phase modulation for broadening spectral bandwidth has been extensively studied,since it was demonstrated.The MPC concept demonstrates significant practical benefits.Essentially,it requires only two curved mirrors and a Kerr medium in between,making it a cost-effective and easily implementable method.Moreover,the MPCs are robust,quite insensitive to beam pointing,and can evendeal with small mode mismatch without transmission losses.These favorable characteristics make MPCs very attractive not only for scientific applications,but also for commercial and facility laser systems where reliability is crucial.The striking progress of the technique in the past six years has made it possible to obtain high average power femtosecond laser.In this work,we demonstrate the generation of a high average power femtosecond laser pulse by nonlinearly compressing the picosecond pulse in the Herriott multi-pass cell device,and the distribution of eigenmode is analyzed.With this efficient and robust scheme,the spectrum is broadened from 0.20 nm to 2.75 nm,with a broadening ratio of 13.75,and the pulse duration of a picosecond amplifier is compressed from 1.25 ps to 780 fs,with a compression factor of 16.

关 键 词：脉冲非线性压缩 光谱展宽 Herriott型多通腔 

分 类 号：TN24[电子电信—物理电子学]