基于衍射透镜的激光雷达接收光学系统设计  

Design of LiDAR Receiving Optical System Based on Diffractive Lenses

作　　者：侯孟霞 范斌[2] 殷家家 刘博[2] 汪利华[2] 刘盾 胡超 Hou Mengxia;Fan Bin;Yin Jiajia;Liu Bo;Wang Lihua;Liu Dun;Hu Chao(National Key Laboratory of Optical Field Manipulation Science and Technology,Chinese Academy of Sciences,Chengdu 610209,Sichuan,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,Sichuan,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Optoelectronics,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院光场调控科学技术全国重点实验室,四川成都610209 [2]中国科学院光电技术研究所,四川成都610209 [3]中国科学院大学,北京100049 [4]中国科学院大学光电学院,北京100049

出　　处：《激光与光电子学进展》2024年第13期350-357,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62075220);中国科学院青年促进会(2023395)。

摘　　要：衍射透镜具有质量轻、面形公差宽松等优势,是轻量化激光雷达光学接收系统的有力选择。为了解决当接收系统F数很小时单片衍射透镜透过率较低的问题,提出一种由衍射透镜、准直组和会聚组等3部分构成的折、衍混合结构,并且基于该结构设计了一套口径为50 mm、视场全角为0.9 mrad、F数为1.78、波段为(1064±0.1) nm的接收光学系统。结果表明,该系统的弥散斑均方根半径远小于艾里斑半径,成像质量接近衍射极限。考虑衍射透镜的衍射效率、玻璃材料的吸收与反射因素,该系统透过率达78.2%,可满足激光雷达对光学接收系统的实际应用需求。因此,该系统可为后续衍射式激光雷达接收光学系统的设计提供参考。Diffractive lenses are lightweight and exhibit loose surface tolerance,rendering them a competitive option for lightweight lidar optical receiving systems.To address the challenge of low transmittance in single diffractive lenses when the Fnumber of the receiving system is small,this study introduces a hybrid structure comprising a diffractive lens,collimating group,and converging group.Based on this structure,a receiving optical system with a 50-mm aperture,a full angle of view of 0.9 mrad,an Fnumber of 1.78,and a wavelength band of(1064±0.1)nm is designed.The analysis results of the system indicate that the rootmeansquare radius of the diffuse spot is significantly smaller than the Airy spot radius,and the imaging quality is approached to the diffraction limit.Considering the diffraction efficiency of the diffractive lens and the absorption and reflection of the glass material,the transmittance of the system is calculated to be 78.2%,meeting the practical application requirements of LiDAR for optical receiving systems.Therefore,a reference for the design of diffractive LiDAR optical receiving systems is provided by this system,offering a solution to enhance transmittance and overall performance.

关 键 词：激光雷达 轻量化 衍射透镜 光学设计 

分 类 号：O439[机械工程—光学工程]