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

被引：0
|
作者：
Yuan Z. [1 ]
Ling W. [1 ]
Chen C. [1 ]
Du X. [1 ]
Wang C. [1 ]
Wang W. [1 ]
Xue J. [1 ]
Dong Z. [1 ]
机构：
[1] Institute of Laser Technology, Tianshui Normal University, Tianshui
来源：
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2021年 / 50卷 / 08期
关键词：
2 μm laser; All solid-state laser; High power laser; High single pulse energy; Tm; Ho: LLF crystal;
D O I：
10.3788/IRLA20210349
中图分类号：
学科分类号：
摘要：
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 1793 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 with 9%. 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 Q-switched mode-locked state. When the maximum pump power is 20 W, the maximum output power is 1052 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. © 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
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