用于多纵模LDs的消偏器研究  

Depolarizer for Multiple Longitudinal Mode LDs

作　　者：刘继红[1] 方强[2] 阴亚芳[3] 

机构地区：[1]中国科学院西安光学精密机械研究所,陕西西安710068 [2]西安邮电学院电子与信息工程系,陕西西安710061 [3]中国科学院研究生院,北京100039

出　　处：《光电子．激光》2006年第5期542-545,共4页Journal of Optoelectronics·Laser

基　　金："十五"科技攻关资助项目(2002BA106B07)

摘　　要：线偏振多纵模(MLM)激光可用适当厚度的晶体波片消偏,波片的光轴和入射光偏振方向呈45°夹角。对2种实际的MLM光源仿真分析了消偏光的偏振度(DOP)与波片厚度的关系,提出了一种可连续、大范围调节光程差(OPD)的实验装置。理论分析和实验结果表明:最佳波片厚度主要由光源的中心波长和纵模间隔决定;DOP决定于光源的谱特征,光谱越对称,强度相对大的纵模数越多,DOP越小。The multiple longitudinal mode （MLM） laser sources can be depolarized by a crystal waveplate with moderate thickness. For two available MLM LDs, the relationship between DOP of depolarized light and optical path difference （OPD）, which is produced by the waveplate between two orthogonal oplarized components of incident light, is numerically calculated. An experimental depolarizer installation is proposed in which OPD can be adjusted continuously in a large range. The theoretical analyses and experimental results show that there is the most appropriate thickness of waveplate for a specific MLM laser source, and this thickness is decided by center wavelength and the space between two longitudinal modes. Moreover, DOP becomes lower if the symmetry of spectrum is well and the number of relative large longitudinal mode increases.

关 键 词：消偏器 多纵模(MLM)LDs 偏振度(DOP) 晶体波片 双折射 

分 类 号：O436.3[机械工程—光学工程]