狭缝式自由旋涡气动窗口光学质量测量方法研究  

Measuring Method of Slit Free-Vortex Aerodynamic Window Optical Quality

作　　者：董玉磊 韦承甫[1] 刘现魁[1] 柳琪[1] 任晓明[1] Dong Yulei;Wei Chengfu;Liu Xiankui;Liu Qi;Ren Xiaoming(The 718th Research Institute of China Shipbuilding Industry Co.,Ltd.,Handan,Hebei 056027,China)

机构地区：[1]中国船舶重工集团公司第七一八研究所,河北邯郸056027

出　　处：《中国激光》2021年第23期51-57,共7页Chinese Journal of Lasers

基　　金：国家863计划(51326010201)。

摘　　要：为了测量稳定运行时超声速自由旋涡气动窗口(ADW)产生的像差,评价ADW的光学性能,提出了一种基于一维自准直Shack-Hartmann传感器,用拼接法进行波前复原测量气动窗口的方法。采用671 nm光源作为测试光源,高帧频CCD面阵相机采集经Shack-Hartmann波前传感器聚焦的子光斑阵列,采用拼接法进行波前复原。讨论分析了波前像差中沿y方向的倾斜量、波前峰谷(PV)值和均方根(RMS)值与气动窗口工作状态的对应关系。实验结果表明,压力稳定时长曝光PV值为0.1729λ,RMS值为0.0578λ。实验数据说明了Shack-Hartmann传感器拼接法对测量ADW光学性能的可行性,对ADW的进一步优化和实际应用具有重要的工程指导意义。Objective Chemical reaction energy is converted to optical energy using a high-energy chemical laser.Its laser beam has good collimation and a high-power density when it is exported.The classic laser’s exporting window is normally made of crystalline material,but the crystalline window’s corrupt practice gradually emerges as laser power increases.There is no one type of crystalline window for the middle-infrared band laser that can withstand temperature distortion without exploding due to bulk absorption.Consequently,the free-vortex aerodynamic window(ADW),which seals the optical antrum using aerodynamics,has been commonly used.When the ADW works,ultrasonic airflow can produce an air curtain to seal the optical antrum.Simultaneously,the quality of the output beam would be affected by the gaseous aberration medium formed as the“window.”Thus,conducting a study concerning ADW’s optical quality is necessary for further improving ADW’s performance.Interferometry,far-field method,shear interferometry,and the Shack-Hartmann(S-H)model method,among others,are available.The reference wavefront interferometry established during ADW’s gauging requires an ideal environment;the far filed process only provides the macroscopic property and cannot quantify the wavefront aberration,putting ADW’s optimization design at a disadvantage;the obtained interferometric fringe shear interference is the result of wavefront difference,in which interpreting both fringes and wavefronts is difficult.The clear aperture of the currently proposed ADW is 280 mm×10 mm,which is a large rectangle.Therefore,the S-H model approach,which uses the Zernike polynomial to rebuild the wavefront,is not appropriate.The unscanned ADW has a large length-width ratio in the paper,resulting in considerable environmental noise.An ADW optical quality detection method that can provide a reference for ADW’s engineering application is required for measuring big length-width ratio ADW’s optical quality in such a complex environment,quantitative analys

关 键 词：测量 激光器 自由旋涡气动窗口 Shack-Hartmann波前传感器 拼接法 光学质量 

分 类 号：TN248.5[电子电信—物理电子学]