激光主动照明均匀性影响因素及其规律  

Influence factors and laws of laser active illumination uniformity

作　　者：罗文[1,2,3] 张飞舟 张建柱[1] Luo Wen;Zhang Fei-Zhou;Zhang Jian-Zhu(Institute of Applied Physics and Computational Mathematics,Beijing 100094,China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China;Graduate School of China Academy of Engineering Physics,Beijing 100088,China)

机构地区：[1]北京应用物理与计算数学研究所,北京100094 [2]中国工程物理研究院流体物理研究所,绵阳621900 [3]中国工程物理研究院研究生院,北京100088

出　　处：《物理学报》2022年第15期130-136,共7页Acta Physica Sinica

摘　　要：针对阶梯相位调制窄谱激光主动照明方法,基于物理模型及工程应用需求,对窄谱激光谱线线型、阶梯相位调制器光学镜数量、光学镜厚度梯度误差三种影响因素,进行了主动照明远场光斑均匀性数值模拟,揭示了照明远场光斑闪烁指数随影响因素的变化规律.结果表明:激光谱线线型对照明光斑均匀性的影响很小,均匀型、高斯型、洛伦兹型激光谱线照明光斑空间闪烁指数均值分别为0.27,0.28,0.28;照明光斑闪烁指数随阶梯相位调制器光学镜数量增多而降低,且逐渐趋于平缓;光学镜厚度梯度毫米量级的误差对闪烁指数的影响很小,误差为–0.6 mm时,空间闪烁指数由0.266增大到0.271,恶化率仅为1.9%.Active illumination with narrow spectrum laser based on ladderlike phase modulator(LPM),is an effective method to improve the illumination uniformity.Laser spectrum style,lens number of LPM,and lens thickness error of LPM are three significant factors influencing the illumination uniformity in engineering.The laws of the three factors with scintillation indexes are analyzed through numerical simulation.The results indicate that the laser spectrum style is not an important factor,and the spatial scintillation index of uniformity,Gauss,Lorenz style narrow spectrum laser are 0.27,0.28,and 0.28 respectively.The scintillation indexes decrease gradually with the lens number of LPM increasing.The spatial scintillation index increases from 0.266 to 0.271,when the lens thickness error of LPM is –0.6 mm.Therefore,several ideas are proposed:when this method is used in the engineering project,some attention should be paid to laser spectrum style,the lens number of LPM should be optimized by considering the laser spectrum width and scintillation index synchronously,and the negative error of optical lens thickness gradient of LPM should be controlled attentively.

关 键 词：主动激光照明 相位调制 闪烁指数 窄谱激光 

分 类 号：TN249[电子电信—物理电子学]