微透镜阵列的合成孔径成像激光雷达收发光学系统  

Synthetic Aperture Imaging Lidar Tran-receiver Optical System Based on Microlens Array

作　　者：高龙 李显杰 安超 欧宗耀 王佩斯 宋子奇 陶宇亮 吴谨 GAO Long;LI Xianjie;AN Chao;OU Zongyao;WANG Peisi;SONG Ziqi;TAO Yuliang;WU Jin(Beijing Institute of Space Mechanics&Electricity,China Academy of Space Technology,Beijing 100094,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国空间技术研究院北京空间机电研究所,北京100094 [2]中国科学院空天信息创新研究院,北京100094

出　　处：《光子学报》2023年第11期204-214,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61705007)。

摘　　要：为解决合成孔径成像激光雷达受制于相干天线定理的问题,扩大成像视场,提高相干收发光学系统效率,提出并研制了基于4×4尾纤式微透镜阵列接收的相干收发光学系统,建立了全视场光学系统耦合效率计算模型,完成了高精度的收发光学系统集成装调及系统光学效率测试。结果表明:发射链路与16路接收链路的光轴最优偏差优于4″,中心视场光学系统效率优于73.1%,全视场光学系统效率优于65.5%,可满足激光雷达成像试验要求。Synthetic Aperture Imaging Lidar(SAIL)is limited by the optical heterodyne detection antenna theorem,the SAIL technology with the single detector is essentially a small field of view imaging.Breaking the limitations of the optical antenna theorem for wide field of view mapped band imaging is a bottleneck problem.In traditional methods,linear array detectors are generally used for wide-field imaging,but this method has imaging pixel spacing and cannot achieve 100%duty ratio imaging.For the application of small target imaging,the gap between pixels can cause serious loss of SAIL image information.Aiming at the above problems,this paper proposes the novel optical system of field division coherent receiving and transmitting lidar received by a 4×4 pigtail microlens array,which can realize the optical imaging technology of long distance and large field division lidar,improves the imaging efficiency of the system,and realizes seamless coverage imaging.The coherent receiving and transmitting lidar is a bistatic system with the wavelength of 1550 nm with the advantage of eye-safety.The transmitter system is composed of beam splitter,half-wave plate,expand telescope,and the divergence angle of the laser beam equal to 105μrad,and the output laser beam is a circular polarization state.Meanwhile,there is a local laser beam act as the monitor system.The receiver system is composed of receiver telescope,quarter wave plate,4×4 microlens array,and the field of view of the receiver system equal to 175μrad.Furthermore,there are the optical axis monitor module,which is composed of two cameras with a smaller field of view and a bigger field of view.It is verified by experiment that the light spot mode,array number and system microlens surface parameters of the pigtail microlens array also meet the index requirements.At the same time,the theoretical calculation model of the optical efficiency of the full field of view with 175μrad is carried out.The simulation results show that the optical efficiency of the full field of view sy

关 键 词：合成孔径成像激光雷达 收发光学系统 微透镜阵列 全视场 光轴偏差 耦合效率 

分 类 号：TN256[电子电信—物理电子学] TN249