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液体介质的循环流动为消除激光系统的热效应提供了有效途径,对改善激光系统的光束质量具有重要意义。根据液体介质的流场特性,结合Fluent6.53软件模拟计算,分析了抽运区介质流速、湍流强度与附面层厚度、温度扰动的关系及对激光热畸变的影响。增大抽运区介质流速能有效减小热畸变和附面层厚度;在给定抽运条件下,采用光阑限孔的方法进一步减小热畸变,流速为20 m/s时的光程差(OPD)最大差值由10个波长下降到5个波长。
Circulation of liquid medium to eliminate the thermal effects of the laser system provides an effective way to improve the laser beam quality of great significance. According to the flow field characteristics of the liquid medium and the simulation calculation of Fluent6.53 software, the relationship between the velocity of the medium in the pumping zone, the turbulence intensity, the thickness of the overburden, the temperature perturbation and the thermal distortion of the laser were analyzed. Increasing the medium flow rate in the pumping zone can effectively reduce the thermal distortion and the thickness of the overburden. With the given pumping conditions, the aperture limiting method is used to further reduce the thermal distortion. When the flow rate is 20 m / s, The maximum difference of OPD drops from 10 wavelengths to 5 wavelengths.