原子频标中激光器高偏振态检测器件设计研究  

Design of High Polarization State Detection Device for Laser in Atomic Frequency Standard

作　　者：陈妍君 黄凯 王秀梅 王晓露 王亮 高连山 CHEN Yan-jun;HUANG Kai;WANG Xiu-mei;WANG Xiao-lu;WANG Liang;GAO Lian-shan(Beijing Instrument of Radio Metrology and Measurement,Beijing 100039,China)

机构地区：[1]北京无线电计量测试研究所,北京100039

出　　处：《宇航计测技术》2021年第4期72-76,共5页Journal of Astronautic Metrology and Measurement

摘　　要：本文研究一种矩形银纳米棒结构消色差波片,分析该波片对光场偏振态的调控特性。以二氧化硅为基底设计银纳米棒波片,长250nm,宽120nm,厚度40nm,周期300nm。通过激发纳米棒表面等离子体效应,产生符合理论的表面电场分布。仿真计算,以45°的线偏振光激发,调制出圆偏振光,满足λ/4波片的性能,适用波段为620nm~668nm,满足钙原子束光频标的激发波长,波片透过率为40%~48%。仿真计算,采用时域有限差分法求解空间电磁场分布,使用三角函数法分析光束偏振态。基于该结构体积小、厚度薄、灵活度高,将其应用于光频原子钟有利于光学调制模块集成化、小型化的实现,有利于辅助激光器调制出高效的偏振光。In this paper,a rectangular silver nanorod structure based on SiO_(2) is explored,with length 250nm,width 120nm,thickness 40nm,and period 300nm.By exciting the surface plasmons effect of the nanorod,the theoretical surface electric field distribution was generated and the polarization of the light field was controlled.In the simulation calculation,the finite difference time domain method is used to solve the spatial electromagnetic field distribution.The polarization state of the beam is analyzed by trigonometric function representation.Because of its small size,thin thickness and high flexibility,application of this structure in atomic frequency standard system is conducive to the realization of instrument integration and miniaturization.This structure is beneficial for the auxiliary laser to modulate highly efficient polarized light.

关 键 词：原子频标 偏振态 激光器 纳米棒结构波片 

分 类 号：O436.3[机械工程—光学工程]