基于薄片增益介质的皮秒激光再生放大器研究  

Research on Picosecond Laser Regenerative Amplifier Based on Thin-Disk Gain Medium

作　　者：董静 陈涵天 王海林[1] 贾贤石 朱广志[1] Aleksei Kozlov 朱晓[1] Dong Jing;Chen Hantian;Wang Hailin;Jia Xianshi;Zhu Guangzhi;Aleksei Kozlov;Zhu Xiao(School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China;POLYUS Research Institute of M.F.Stelmakh Johit Stock Compcuiy,Moscoiv 117342,Russia)

机构地区：[1]华中科技大学光学与电子信息学院,湖北武汉430074 [2]M.F.Stelmakh股份有限公司极地研究所,俄罗斯莫斯科117342

出　　处：《光学学报》2021年第14期118-125,共8页Acta Optica Sinica

基　　金：国家重点研发计划战略性国际科技创新合作重点专项(2016YFE0202500)。

摘　　要：近年来,超快激光器已成为激光精密制造的主力光源。为进一步提高激光加工效率和加工能力,需获得更高平均功率、更大单脉冲能量的超短脉冲激光器。本文基于自研的单薄片模块和串接的双薄片模块分别搭建了一套皮秒薄片激光再生放大器,其中基于单薄片模块的再生放大器采用脉宽小于10 ps的种子源,最终获得平均功率44.2 W、脉冲宽度9.3 ps、单脉冲能量220μJ的脉冲激光输出,放大器效率约为13.4%。基于串接的双薄片模块的再生放大器采用脉宽800 ps的种子源,在重复频率200 kHz时获得了126 W的激光输出,在重复频率100 kHz时,实现最大输出单脉冲能量为0.96 mJ。考虑到放大的自发辐射的影响,对单薄片结构再生放大器的动力学过程进行了理论建模,得到和实验相符的结果。更进一步的仿真计算和实验表明较低的单程增益使得薄片再生放大器的光光效率受腔内损耗影响较大,降低腔内损耗是实现高效率薄片再生放大器的关键之一。In recent years, ultrafast lasers have become the main source of laser precision manufacturing. The further improvement of laser processing efficiency and capability requires ultrashort pulse lasers with higher average power and single pulse energy. In this paper, two picosecond thin-disk laser regenerative amplifiers are developed based on one thin-disk module and two thin-disk modules connected in series, respectively. For the regenerative amplifier with one thin-disk module, on the basis of a seed source with a pulse width lower than 10 ps, the pulse laser with an average power of 44.2 W, a pulse width of 9.3 ps, and single pulse energy of 220 μJ is output, and the optical-optical efficiency of the amplifier is about 13.4%. For the regenerative amplifier based on two thin-disk modules connected in series, a seed source with a pulse width of 800 ps is adopted;then, we obtain a laser output of 126 W at a repetition frequency of 200 kHz and maximum single pulse energy of 0.96 mJ at a repetition frequency of 100 kHz. Considering the effect of amplified spontaneous emission, the dynamic process of the regenerative amplifier with one thin-disk module is theoretically modeled, and the results are consistent with the experimental ones. Further simulations show that the low single-pass gain makes the optical-optical efficiency of the thin-disk regenerative amplifiers greatly affected by the intra-cavity loss, and reducing the intra-cavity loss is one of the keys to achieving a high-efficiency thin-disk regenerative amplifier.

关 键 词：激光器 薄片激光器 再生放大器 皮秒激光 脉冲动力学 

分 类 号：TN248.1[电子电信—物理电子学]