椭球粒子烟雾浓度对激光偏振度影响的实验研究  

Experimental study on impact of ellipsoidal particle smoke concentration on laser DOP

作　　者：马莉莉 段锦[1] 于婷 战俊彤[2] 鲍富成 郭红芮 Ma Lili;Duan Jin;Yu Ting;Zhan Juntong;Bao Fucheng;Guo Hongrui(School of Electronics and Information Engineering Institute,Changchun University of Science and Technology,Changchun 130022,China;Optoelectronics Engineer Institute,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学电子信息工程学院,吉林长春130022 [2]长春理工大学光电工程学院,吉林长春130022

出　　处：《应用光学》2018年第6期921-928,共8页Journal of Applied Optics

基　　金：国家863计划;国家973计划;总装预研基金;吉林省科技攻关项目(201502045GX)

摘　　要：以斯托克斯矢量理论为基础,通过搭建偏振传输半实物模拟装置进行模拟实验,观测激光在模拟环境(不同浓度的椭球粒子在非均匀分布状态)下偏振度(degree of polarization,DOP)的变化。实验选取灵芝孢子碳化粉末作为椭球粒子的实验对象,通过烟雾机将椭球粒子形成不同浓度的烟雾,研究入射波长为532nm、671nm的激光在0°、+45°、90°的线偏振光以及左旋圆偏振光经过模拟环境后偏振度(DOP)的变化情况。实验结果表明:入射偏振光随着烟雾浓度的增大,偏振度呈下降趋势;3种入射线偏振光随浓度增大降幅不尽相同,没有明显的规律可循;不同波长低浓度烟雾时,线偏振光与圆偏振光的偏振度下降幅度大抵相同,大约为3%左右;随着烟雾浓度的增大,线偏振光的偏振度表现出不同程度的下降,可达20%,圆偏振光的偏振度仅下降5%,表现出了较好的保偏能力。Based on the Stokes vector theory, a simulation experiment was carried out by setting up a semiphysical simulation device for polarization transmission to observe the change of the degree of polarization（DOP） of laser under simulated environment（different concentrations of ellipsoidal particles in the nonuniform distribution）. In the experiment, the Ganoderma spore carbonized powder was selected as the experimental object of ellipsoidal particles. The ellipsoidal particles were formed into different concentrations of smoke by a fog machine. The change of the degree of polarization （DOP） for linearly polarized light with incident wavelength of 532 nm and 671 nm at 0°, ＋45°, 90° , and the lefthanded circularly polarized light after passing through the simulated environment was studied. Experimental results indicate that the DOP of the incident polarized light shows a downward trend with the smoke concentration increases;the increase of the polarized light of the three kinds of incident light varies with the concentration, and there is no obvious rule to follow;when the smoke of different wavelengths and low concentration is used, the DOP of the linearly polarized light and the circularly polarized light is about the same, about 3%;as the concentration of smoke increases, the DOP of linearly polarized light shows different degrees of decline, up to 20%, and it of the circularly polarized light decreases by only 5%, showing a better polarization maintaining ability.

关 键 词：偏振传输 斯托克斯矢量 椭球粒子 非均匀分布 偏振度 

分 类 号：TN206[电子电信—物理电子学] O439[机械工程—光学工程]