基于72通泵浦的克尔透镜锁模Yb∶YAG薄片激光器  

72-Pass Pumped Kerr Lens Mode-Locked Yb:YAG Thin-disk Laser

作　　者：雷希音 刘锐[1] 李辉 李想 戴隆辉 公发全[1] 邓淞文[1] 吕起鹏[1] 贾勇[1] 孙天祥 王锋[1] 李刚[1] Lei Xiyin;Liu Rui;Li Hui;Li Xiang;Dai Longhui;Gong Faquan;Deng Songwen;LüQipeng;Jia Yong;Sun Tianxiang;Wang Feng;Li Gang(Key Laboratory of Chemical Lasers,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;University of Chinese Academy of Sciences,Beijing 100049,China;Zhengzhou Tobacco Research Institute of CNTC,Zhengzhou 450001,Henan,China)

机构地区：[1]中国科学院大连化学物理研究所化学激光重点实验室,辽宁大连116023 [2]中国科学院大学,北京100049 [3]中国烟草总公司郑州烟草研究院,河南郑州450001

出　　处：《中国激光》2023年第14期43-49,共7页Chinese Journal of Lasers

基　　金：大连市科技创新基金(2018J11CY013)。

摘　　要：基于自主研制的72通薄片泵浦模块进行了克尔透镜锁模薄片激光技术研究。首先,分析了薄片克尔透镜锁模原理。然后,基于ABCD矩阵和孤子锁模理论设计了谐振腔。最后,基于72通泵浦模块进行了克尔透镜锁模谐振腔飞秒脉冲实验研究,当泵浦功率为72 W时,获得了平均功率为11.78 W、脉冲宽度为243 fs、重复频率为81.45 MHz的飞秒脉冲输出;优化腔型后,在94 W泵浦时得到了22.33 W的输出功率,脉冲宽度为394 fs。Objective High-power femtosecond lasers are widely utilized in various research fields such as terahertz(THz) generation,frequency comb,and high harmonic generation because of their short pulsed width,high peak frequency,and good beam quality.However,owing to strong thermal lens effect,the output power of lasers based on traditional bulk-shaped gain medium is limited to the 20 W level.Further,fiber lasers are restricted by nonlinear effects such as stimulated Brillouin scattering at high output power.The emergence of thin disk lasers(TDL) has facilitated the simultaneous solving of these two problems.A thickness of only a few hundreds of micrometers combined with effective back-side cooling technique can significantly reduce the influence of thermal lens effect and nonlinear effects.In addition,multiple pass pump module guarantees high absorption efficiency under the condition that the gain medium is extremely thin.Currently,femtosecond lasers based on thin disk medium are mainly achieved using the semiconductor saturable absorber mirror(SESAM) mode-locking and Kerr Lens mode-locking(KLM).The highest output power obtained using the former(350 W) is higher than that of KLM(270 W);however,KLM lasers exhibit better performance in the aspect of pulse width,peak power,cost,and stability of key components.Thus,KLM TDL is a promising candidate for light sources in high field science and nonlinear optical researches.Methods We investigate KLM thin disk lasers by using our home-made 72-pass pump module.First,we analyze the principles of Kerr lens mode-locking in thin disk lasers to ensure that the mode radius at the pinhole decreases at a proper ration following the insertion of the Kerr medium,or the virtual Kerr Lens at the beam waist.Subsequently,we demonstrate the cavity design method based on ABCD matrix and soliton mode-locking theory.On the basis of this method,we design the KLM TDL cavity by employing a focusing mirror pair with the radius of curvature(RoC) of 150 mm.In addition,we simulate the mode radius in the

关 键 词：激光器 薄片激光器 多通泵浦 克尔透镜锁模 飞秒激光 

分 类 号：TN248.1[电子电信—物理电子学]