中国激光, 2009, 36 (s1): 16, 网络出版: 2009-06-18  

激光二极管端面抽运钕玻璃薄片放大器的热效应

Research on Thermal Effect in Laser Diode-End-Pumped Nd∶Glass Laser Amplifier
作者单位
1 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
2 国防科技大学理学院, 湖南 长沙410073
摘要
激光二极管(LD)端面抽运的中等口径片状放大器可实现重复频率工作, 兼顾大能量输出和优良光束质量, 成为惯性聚变能(IFE)及战术**等领域的研究热点。钕玻璃介质具有制造工艺成熟、储能较高、受激发射截面适中等优点, 是美、日等国IFE领域的重要研究对象。但钕玻璃热导率较低, 重复频率应用时热致波前畸变、热致断裂等热效应明显。使用光线追迹和有限元方法, 结合高功率端面抽运重复频率钕玻璃放大器的工作特点, 对钕玻璃增益介质的温度场和应力场进行了模拟分析, 详细讨论了不同抽运功率、冷却参数、工作频率所带来的影响。同时分析了可能引发介质炸裂的机理, 探讨了抽运极限问题, 结果将对端面抽运重复频率钕玻璃激光放大器的设计具有参考意义。
Abstract
As laser diode-end-pumped laser amplifier of moderate aperture can realize repeated-rate high energy output and good beam quality, it is paid more attention as inertial fusion energy (IFE) driver and directional energy weapon (DEW). Ndglass as laser medium has many advantages, such as easy to manufacture, high storage energy, moderate emission cross section. However, its thermal conductivity is low and thermal effect is serious. Therefore, through analysis for the performance features of laser diode-end-pumped Ndglass laser amplifier, a ray tracing and finite element thermal model is established, and 3D and transient distributions of temperature and thermal stress in Nd:glass are simulated. The impacts of pump power, cooling parameter and repeat rate are mentioned, the mechanism of thermal fracture is also analyzed. The results are helpful of designing laser diode-end-pumped repeated-rate Nd∶glass laser amplifier.

王明哲, 罗亦鸣, 李明中, 丁磊, 邓青华, 唐军, 景峰. 激光二极管端面抽运钕玻璃薄片放大器的热效应[J]. 中国激光, 2009, 36(s1): 16. Wang Mingzhe, Luo Yimin, Li Mingzhong, Ding Lei, Deng Qinghua, Tang Jun, Jing Feng. Research on Thermal Effect in Laser Diode-End-Pumped Nd∶Glass Laser Amplifier[J]. Chinese Journal of Lasers, 2009, 36(s1): 16.

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