基于偏振锁相的非线偏-线偏光转换技术研究  

Research on Conversion Technology from Non-Polarized to Linearly Polarized Laser Based on Principle of Polarization Phase Locking

作　　者：董苏惠 王小林[1] 粟荣涛[1] 周朴[1] 杨丽佳[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,湖南长沙410073

出　　处：《中国激光》2016年第2期32-37,共6页Chinese Journal of Lasers

基　　金：湖南省自然科学基金(14JJ3004)

摘　　要：报道了一种基于偏振锁相的自适应非线偏光-线偏光的产生方法。将激光器输出的非保偏光分成两束偏振态相互垂直的线偏光,基于偏振相干合成的原理,利用基于随机并行梯度下降算法的相位调制器将两个偏振态的光束的相位差锁相到mπ,合成输出的光束即为高消光比的线偏光。理论上,建立了该方法的数学模型,并分析了各种因素对输出消光比和转换效率的影响。实验上,利用空间结构的光路,搭建了相应的实验系统,实现了非线偏激光到线偏振光的自适应偏振转换,获得输出激光偏振度为93.5%,转换效率为88%的线偏振激光输出。A novel method to adaptively convert laser beam from non-polarized to linearly polarized based on the principle of polarization phase locking is presented. The non-polarization laser is divided into two beams whose polarization states are perpendicular to each other by a polarization splitter. Based on the principle of coherent polarization beam combining, and used the phase modulator whose operating voltage is optimized by parallel gradient descent algorithm to keep the difference of phase of the two splitter beams to m~. The output beam is linearly polarized laser with high polarization extinction ratio. In theory, the model of adaptive polarization conversion is built, and the factors affecting the efficiency and polarization extinction ratio are analyzed. In experiment, experiment system is built based on the optical path of flee-space structure, and the adaptive conversion of non-polarization maintaining laser to a linearly one with the polarization extinction ratio of 93.5% and the converting efficiency of 8896 is realized.

关 键 词：物理光学 非线偏光 线偏光 偏振锁相 随机并行梯度下降算法 

分 类 号：O436.3[机械工程—光学工程]