基于声光调制器的主动调Q Tm:YLF激光器的实验与理论研究

Experimental and Theoretical Study of an Actively Q-Switched Tm:YLF Laser with an Acousto-Optic Modulator.

作者信息

Guo Lei, Yang Yaling, Wang Ruihua, Zhang Baitao, Li Tao, Zhao Shengzhi, He Jingliang, Yang Kejian

机构信息

School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan 232001, China.

Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.

出版信息

Molecules. 2021 Dec 2;26(23):7324. doi: 10.3390/molecules26237324.

DOI:10.3390/molecules26237324

PMID:34885911

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8659234/

Abstract

We report the characteristics of a diode-end-pumped, high-repetition-rate, acoustic-optic (AO) Q-switched Tm:YLF laser operating from 5 kHz to 10 kHz. In the continuous-wave (CW) regime, a maximum average output power of 8.5 W was obtained with a slope efficiency of 30.7%. Under the AO Q-switching regime, a maximum output power of 7.32 W was obtained at a repetition frequency of 5 kHz with a pulse width of 68 ns and a pulse energy of 1.4 mJ, corresponding to a peak power of 21.5 kW. A time-dependent rate equation model is introduced to theoretically analyze the results obtained in the experiment, in which the cross-relaxation phenomenon, upconversion losses and ground-state depletion are taken into account. Additionally, the evolution processes of population inversion density and intracavity photon number density with time are also presented. The theoretical results well predict the dependence of laser output characteristics of Tm:YLF crystal on the incident pump powers.

摘要

我们报告了一台二极管端面泵浦、高重复频率、声光（AO）调Q的Tm:YLF激光器的特性，其重复频率在5千赫兹至10千赫兹之间。在连续波（CW）模式下，获得了8.5瓦的最大平均输出功率，斜率效率为30.7%。在AO调Q模式下，在5千赫兹的重复频率下获得了7.32瓦的最大输出功率，脉冲宽度为68纳秒，脉冲能量为1.4毫焦，对应峰值功率为21.5千瓦。引入了一个与时间相关的速率方程模型，对实验结果进行理论分析，其中考虑了交叉弛豫现象、上转换损耗和基态耗尽。此外，还给出了粒子数反转密度和腔内光子数密度随时间的演化过程。理论结果很好地预测了Tm:YLF晶体激光输出特性对入射泵浦功率的依赖性。