正交级联液晶偏振光栅的收发分离结构设计  

Design of transceiver separation structure for orthogonal cascaded liquid crystal polarization gratings

作　　者：刘壮[1,2] 王启东[2] 史浩东[1] 王超[1] 秦欢[3] Liu Zhuang;Wang Qidong;Shi Haodong;Wang Chao;Qin Huan(Institute of Space Photo-electronics Technology,Changchun University of Science and Technology,Changchun 130022,China;State Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;College of Optoelectronics Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学空间光电技术研究所,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033 [3]长春理工大学光电工程学院,吉林长春130022

出　　处：《红外与激光工程》2021年第11期228-235,共8页Infrared and Laser Engineering

基　　金：国家自然科学基金(61805028);吉林省教育厅“十三五”科学技术研究规划项目(JJKH20190566KJ);应用光学国家重点实验室开放基金(SKLAO2021001A08)。

摘　　要：正交级联液晶偏振光栅可实现光束大范围偏转,在空间激光通信与激光雷达等领域具有广阔的应用前景,其大部分应用领域均需要同时发射激光与接收激光,如何解决发射光与接收光分离的问题尚未见报道。针对这一问题,文中根据1/4波片、1/2波片以及液晶偏振光栅理论推导了线偏振光源经过被动液晶偏振光栅层以及正交级联液晶偏振光栅后偏振态的变化,验证了出射光偏振态与光束偏转角度的可逆性。采用偏振分光棱镜、1/4波片、1/2波片、正交级联液晶偏振光栅等器件设计了一种可实现发射光与接收光偏转与分离的光学结构,构建了测试系统,最后通过测试结果证明了理论的正确性与结构的适用性。Orthogonal cascaded liquid crystal polarization grating can realize optical beam large angle-scale deflection,and has broad application prospects in the fields of space laser communication and LiDAR.It need to emit and receive laser at the same time in most application fields,but how to solve the problem of separating emitted light from received light has not been reported.To solve this problem,change of polarization state of outgoing polarization light source after passing through passive liquid crystal polarization grating layer and orthogonal cascade liquid crystal polarization grating was deduced based on the theories of 1/4 wave plate,1/2 wave plate and liquid crystal deflection grating,the reversibility of the polarization state of the outgoing light and the beam deflection angle was verified.An optical structure which could realize the deflection and separation of transmitted beam and received beam was designed using polarization splitting prism,1/4 wave plate,1/2 wave plate and orthogonal cascade liquid crystal polarization grating.A test system was constructed,the test results prove the correctness of the theory and the applicability of the optical structure finally.

关 键 词：光学设计 液晶偏振光栅 正交级联 偏振态 透过率 

分 类 号：O439[机械工程—光学工程]