转动窗口在高能激光器中的应用

为满足高能激光从谐振腔真空室到大气环境的输出要求，减小窗口热变形对输出激光束性能的影响，提出了一种通过旋转固体窗口降低其受辐照功率密度的解决方案。该方案通过大力矩空心直流电机带动固体窗口匀速转动，并采用高精度动密封圈隔离真空和大气，使得强激光对CaF2窗口的辐照均匀化，从而大大减小CaF2窗口的温度梯度和应力，极大改善了输出光束性能，并有效避免了长时间出光时CaF2窗口炸裂现象的发生。研究结果表明：该方案具有体积小、重量轻、结构紧凑、使用方便和性能可靠等优点，可有效改善激光器输出光束质量，使高能激光长时间输出成为可能。

Abstract

In order to meet the requirement of highenergy laser output from a vacuum resonator to atmosphere and reduce the effect of windows thermal deformation on laser beam performance, the paper introduces a technical solution which can reduce laser irradiation on solid window. In the solution, solid window is driven by high torque hollow DC motor and rotates uniformly. The isolation between vacuum resonator and environmental atmosphere is fulfilled by highprecision dynamic seals. And thus the irradiation on window is more uniform, i.e. the window temperature and stress gradient are decreased greatly, the laser beam quality is improved, and cracks in window can be avoided in longtime running. The results show that the solution is of several advantages, such as small volume, light weight, compact configuration, easy to use and maintain. It can improve laser beam quality efficiently and make longtime running of highenergy laser possible.

参考文献

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郭建增, 刘铁根, 王振华, 周小红. 转动窗口在高能激光器中的应用[J]. 强激光与粒子束, 2011, 23(9): 2309. Guo Jianzeng, Liu Tiegen, Wang Zhenhua, Zhou Xiaohong. Application of rotating window to highenergy laser[J]. High Power Laser and Particle Beams, 2011, 23(9): 2309.

转动窗口在高能激光器中的应用

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