低温Yb:YAG放大器增益与热畸变特性实验研究

蒋新颖; 王振国; 郑建刚; 严雄伟; 李明中; 田晓琳

doi:doi:10.11884/hplpb201426.111007

强激光与粒子束, 2014, 26 (11): 111007, 网络出版: 2014-12-08

低温Yb:YAG放大器增益与热畸变特性实验研究

Experimental research of gain and thermal aberration properties of cryogenic Yb:YAG laser amplifier

论文大纲

蒋新颖 ^*王振国郑建刚严雄伟李明中田晓琳

作者单位

中国工程物理研究院激光聚变研究中心, 四川绵阳 621900

激光放大器小信号增益低温激光器热畸变 laser amplifier small signal gain cryogenic laser thermal aberration

摘要

为了研究低温条件下Yb:YAG放大器的增益和热特性，搭建了一套液氮冷却的低温放大器，开展了实验研究。测量了不同泵浦强度下的小信号增益以及低温和常温下的介质热致波前畸变。结果表明:低温条件下，可以用更少的泵浦能量得到高于常温的增益;常温下泵浦电流200 A、脉冲宽度1200 μs的小信号增益为1.59;低温下泵浦电流200 A、脉冲宽度400 μs的小信号增益为1.82，光光效率显著提高。自发辐射放大(ASE)问题在低温下更加显著，采用短脉冲泵浦有利于降低ASE的影响。低温的热管理效果较常温有显著提高，可以在更高的平均功率下运行。

Abstract

In order to study the gain and thermal aberration properties of cryogenic Yb:YAG amplifier, a liquid nitrogen cooled Yb:YAG laser amplifier was built. Small signal gain for different pumping intensity and thermal aberration at room temperature and cryogenic temperature were measured. The results show that, with less pumping energy higher gain could be obtained at cryogenic temperature than at room temperature. At room temperature with pumping current 200 A and pumping duration 1200 μs, the small signal gain is 1.59; at cryogenic temperature with pumping current 200 A and pumping duration 400 μs, the small signal gain is 1.82. The optical to optical efficiency has increased observably. The effect of amplified spontaneous emission (ASE) is more evident at cryogenic temperature. Using short duration pumping can reduce the effect of ASE. The effect of thermal management was increased significantly at cryogenic temperature, and the laser amplifier can run at a higher average power.

参考文献

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蒋新颖, 王振国, 郑建刚, 严雄伟, 李明中, 田晓琳. 低温Yb:YAG放大器增益与热畸变特性实验研究[J]. 强激光与粒子束, 2014, 26(11): 111007. Jiang Xinying, Wang Zhenguo, Zheng Jian’gang, Yan Xiongwei, Li Mingzhong, Tian Xiaolin. Experimental research of gain and thermal aberration properties of cryogenic Yb:YAG laser amplifier[J]. High Power Laser and Particle Beams, 2014, 26(11): 111007.

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