纵向抽运准三能级Yb∶YAG激光器的理论模型及实验研究

汪莎; 陈军; 刘崇; 胡淼; 葛剑虹; 赵广军; 徐军

中国激光, 2009, 36 (1): 23, 网络出版: 2009-02-10

纵向抽运准三能级Yb∶YAG激光器的理论模型及实验研究

Theoretical and Experimental Research of End Pumped Quasi-Three-Level Yb∶YAG Laser

论文大纲

汪莎 ^1,*陈军 ¹刘崇 ¹胡淼 ¹葛剑虹 ¹赵广军 ²徐军 ²

作者单位

¹ 浙江大学光学仪器国家重点实验室, 浙江杭州 310027

² 中国科学院上海光学精密机械研究所, 上海 201800

激光器速率方程腔型结构准三能级 Yb∶YAG晶体 lasers rate equations cavity structure quasi-three-level Yb∶YAG crystal

摘要

在激光谐振腔中, 边缘冷却的激光晶体中存在着温度梯度分布, 从而使激光晶体等效为一个热透镜。热透镜效应对固体激光器的性能影响很大。由于热透镜效应, 振荡光光斑半径会随抽运光功率及激光谐振腔腔型结构的变化而变化, 这将影响输出光功率的大小。在考虑振荡光光斑半径随抽运光功率及谐振腔变化的情况下给出了速率方程的表达式, 并采用数值方法求解。由理论分析可知, 输出光功率与抽运光功率及谐振腔腔型结构有关。在相同的抽运功率下, 腔型不同输出光功率不同。采用930 nm纵向抽运, 发射光波长1030 nm的准三能级Yb∶YAG晶体在三种不同腔型结构下进行实验, 实验结果表明腔型结构对激光输出功率影响很大。实验结果与模拟符合较好。

Abstract

In laser resonator, temperature gradient distribution exists in the edge cooling laser crystal, which makes laser crystal be equivalent to a thermal lens. The laser beam diameter changes with the pump power and the laser resonator structure due to the thermal lens effect, which influences the output power. Rate equations considering the variation of the laser beam diameter are presented and numerical methods are used to solve them. The theoretical results show that the relationship between the output power and the pump power depends on the laser cavity structure. Experiments are taken with 940 nm end pumped Yb∶YAG with emission of 1030 nm. Experimental results show that output power is influenced by the cavity structure. The experimental data agree well with the stimulation results.

参考文献

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汪莎, 陈军, 刘崇, 胡淼, 葛剑虹, 赵广军, 徐军. 纵向抽运准三能级Yb∶YAG激光器的理论模型及实验研究[J]. 中国激光, 2009, 36(1): 23. Wang Sha, Chen Jun, Liu Chong, Hu Miao, Ge Jianhong, Zhao Guangjun, Xu Jun. Theoretical and Experimental Research of End Pumped Quasi-Three-Level Yb∶YAG Laser[J]. Chinese Journal of Lasers, 2009, 36(1): 23.

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