高单脉冲能量被动调Q锁模Tm,Ho:LLF激光器  

High single pulse energy passively Q-switched mode-locked Tm, Ho:LLF laser

作　　者：袁振 令维军[1] 陈晨 杜晓娟 王翀 王文婷 薛婧雯 董忠[1] Yuan Zhen;Ling Weijun;Chen Chen;Du Xiaojuan;Wang Chong;Wang Wenting;Xue Jingwen;Dong Zhong(Institute of Laser Technology,Tianshui Normal University,Tianshui 741001,China)

机构地区：[1]天水师范学院激光技术研究所,甘肃天水741001

出　　处：《红外与激光工程》2021年第8期121-126,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(11774257,61564008);国家重点研发计划(2017YFB0405204);甘肃省高等学校产业支撑计划项目(2020C-23);甘肃省重点研发计划项目(21YFIGE300)。

摘　　要：报道了一种采用氧化石墨烯作为可饱和吸收体的二极管泵浦的被动调Q和调Q锁模运转的Tm, Ho:LLF激光器。采用透过率分别为3%、5%和9%的输出镜,首先研究了Tm, Ho:LLF激光器的连续运转特性。实验和模拟结果均表明采用透过率为9%的输出镜输出特性最好,当最大泵浦功率为20 W时,连续光输出功率高至1 793 mW。接着以氧化石墨烯为饱和吸收体,采用透过率为9%的输出镜研究了Tm, Ho:LLF激光器的调Q和调Q锁模特性。实验表明:当790 nm LD泵浦功率小于7.26 W时,激光处于单纯调Q运转状态;当大于7.26 W时,激光器进入稳定的调Q锁模状态,当最大泵浦功率为20 W时,最大输出功率为1 052 mW,锁模重复频率为53.19 MHz,对应的平均单脉冲能量为19.77 nJ,该单脉冲能量是目前2μm锁模激光器的最高指标,同时证实了氧化石墨烯材料在大能量高功率激光锁模中是发展潜力优良的二维锁模材料。A LD pumped passively Q-switched and Q-switched mode-locked Tm, Ho: LLF laser using graphene oxide as saturable absorber was reported. Using output mirrors with transmittance of 3%, 5% and 9%, the continuous operation characteristics of Tm, Ho: LLF laser were studied. The experimental and simulation results show that the output mirror with 9% transmittance has the best output characteristics. When the maximum pump power is 20 W, the CW output power is as high as 1 793 mW. Then, the Q-switched and Q-switched mode-locked characteristics of Tm, Ho: LLF laser were studied by using graphene oxide as saturable absorber under OC with9%. The experimental results show that when the pump power of 790 nm LD is less than 7.26 W, the laser is in a simple Q-switched state. When the power is greater than 7.26 W, the laser operation enters into a stable Qswitched mode-locked state. When the maximum pump power is 20 W, the maximum output power is 1 052 mW,the repetition rate of mode-locked is 53.19 MHz, and the corresponding average single pulse energy is 19.77 nJ.This average single pulse energy is currently the highest level of a 2 μm mode-locked laser. At the same time, it is confirmed that graphene oxide is a promising two-dimensional mode-locked material in high-energy mode-locked lasers.

关 键 词：2μm激光器 全固态激光器 TM Ho:LLF晶体 高单脉冲能量 高功率激光器 

分 类 号：TN248.1[电子电信—物理电子学]