中国激光, 2010, 37 (4): 965, 网络出版: 2010-04-20
利用N2/He混合气提高自由旋涡气动窗口的光学性能
Improving Optical Performance of the Free-Vortex Aerodynamic Window by N2/He Mixture
激光器 气动窗口 剪切层 光学质量 自由旋涡 波前畸变 lasers aerodynamic window shear layer optical quality free-vortex wavefront distortion
摘要
为减小激光束透过超声速自由旋涡气动窗口时的退化畸变,提高光束质量,基于气动窗口(ADW)射流外侧剪切层与环境折射率和压力同时匹配理论,提出N2/He双组元混合气射流工质方案,讨论了混合气组分比例确定方法。对N2和N2/He混合气两种射流工质分别进行了实验,以波长为0.6328 μm的He-Ne激光器为光源,用哈特曼波前传感器采集数据,给出了激光束透过射流时的波像差峰谷(PV)值。结果表明,N2为射流工质时,波前畸变峰谷值约为0.18 μm;N2/He混合气为射流工质时,波前畸变峰谷值约为0.13 μm,说明N2/He混合气取代N2作为射流工质,可以有效提高气动窗口的光学质量。
Abstract
In order to minimize optical distortion of beam introduced by gas jet stream and improve optical transmission quality,a project of utilizing N2/He mixture as working gas is proposed based on matching index-of-refraction and equalizing pressure. The method for determining gas mixture composition is also discussed. Experiments are carried on N2 and N2/He mixture respectively,and the laser beam wavefront aberration peak-to-valley (PV) value is measured from the data collected by Hartmann sensor. The results show that the wavefront distortion PV value of aerodynamic window (ADW) is 0.18 μm approximately in case of N2;while that is 0.13 μm in case of N2/He mixture. The optical quality of the ADW can be improved by using N2/He mixture as working gas instead of N2.
刘盛田, 柳琪, 陈良, 李金雪, 李柱, 郭建增. 利用N2/He混合气提高自由旋涡气动窗口的光学性能[J]. 中国激光, 2010, 37(4): 965. Liu Shengtian, Liu Qi, Chen Liang, Li Jinxue, Li Zhu, Guo Jianzeng. Improving Optical Performance of the Free-Vortex Aerodynamic Window by N2/He Mixture[J]. Chinese Journal of Lasers, 2010, 37(4): 965.
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