中国激光, 2017, 44 (4): 0401002, 网络出版: 2017-04-10   

基于非稳腔的非链式脉冲HF激光光束质量优化

Laser Beam Quality Optimization of No-Chain Pulsed HF Laser Using Unstable Resonator
作者单位
西北核技术研究所激光与物质相互作用国家重点实验室, 陕西 西安 710024
摘要
采用正支虚共焦非稳腔对非链式脉冲HF激光谐振腔进行了优化, 提高了激光光束质量。采用不同放大倍率和不同模体积直径, 设计了5种不同参数的激光谐振腔。利用聚焦法测量了焦面远场光斑, 采用衍射极限倍数法分析了激光光束质量变化规律, 比较了不同腔参数激光脉冲能量的变化规律。实验结果表明, 非稳腔放大倍率大于2.5倍情况下, 可以得到约2.3倍衍射极限的激光输出。为了得到较好的实验结果, 在实验所用的放电电极结构下, 激光模体积直径控制在增益区截面直径的80%以内情况下得到的光束质量较好。
Abstract
The beam quality of no-chain pulsed HF laser cavity is improved by optimizing a positive branch confocal unstable resonator. Cavity structures of five different parameters are designed with different cavity magnifications and laser mode volume diameters. The effect of different cavity structure parameters on laser beam quality and laser pulse energy are studied by using the diffraction limit magnification based on the measuring of the focusing spots. The experimental result shows that diffraction limit magnification of 2.3 can be reached with the cavity magnification larger than 2.5. In order to get a better experimental result, the optimum diameter of mode volume is controlled within 80% of the gain cross section, and a better laser beam quality is obtained under the discharge electrode structure in the experiment.
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朱峰, 黄珂, 周松青, 栾昆鹏, 沈炎龙, 易爱平, 李高鹏. 基于非稳腔的非链式脉冲HF激光光束质量优化[J]. 中国激光, 2017, 44(4): 0401002. Zhu Feng, Huang Ke, Zhou Songqing, Luan Kunpeng, Shen Yanlong, Yi Aiping, Li Gaopeng. Laser Beam Quality Optimization of No-Chain Pulsed HF Laser Using Unstable Resonator[J]. Chinese Journal of Lasers, 2017, 44(4): 0401002.

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