大口径菲涅耳透镜远距离宽光谱聚光系统设计  

Design of Long-Distance Wide-Spectrum Condensing System with Large Aperture Fresnel Lens

作　　者：文雅 汪书勤 李浩然 徐绍伟 陶宇亮[3] 赵星[1,2] 刘伟伟 Wen Ya;Wang Shuqin;Li Haoran;Xu Shaowei;Tao Yuliang;Zhao Xing;Liu Weiwei(Institute of Modern Optics,Nankai University,Tianjin 300350,China;Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology,Tianjin 300350,China;Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]南开大学现代光学研究所,天津300350 [2]天津市微尺度光学信息技术科学重点实验室,天津300350 [3]北京空间机电研究所,北京100094

出　　处：《中国激光》2023年第7期123-130,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2018YFB0504400);国家自然科学基金(62075106)。

摘　　要：针对使用光纤光谱仪探测远距离宽光谱弱信号的应用需求,基于成像光学与非成像光学的混合设计方法,设计了大口径菲涅耳透镜聚光系统。系统由直径为1.1 m的菲涅耳透镜、匀光棒、全反射准直器和中继透镜组组成,接收端为直径为2 mm、数值孔径为0.22的光纤束。大口径菲涅耳透镜具有质轻体小的优点,解决了传统大口径透镜体积大质量大的问题。由匀光棒和全反射准直器组成的非成像光学元件后组可减小由菲涅耳透镜口径增大引起的球差和宽光谱色差,使光信号能量分布更加均匀且出射角度减小;中继透镜组进一步控制光束发散角和光斑尺寸,使光信号在光纤束端面高效率耦合,提高系统的光能利用率。仿真和实验结果均表明,所设计的后组系统能够减小像差影响,有效控制光束发散角度和光斑尺寸,提高光能利用率,满足光纤光谱仪对远距离宽光谱弱信号进行光谱探测的需要。Objective To meet the requirements for using an optical fiber spectrometer to detect weak signals over long distances and across a wide spectrum,and considering the sensitivity of the spectrometer,a large aperture optical system is needed so that sufficient optical signals can be obtained.In addition,the aperture of the receiving surface of the optical fiber bundle is small,making it difficult for the lens to match the numerical aperture of the optical fiber bundle.Therefore,the focal spot size and convergence angle should be as small as possible to efficiently couple optical signals into the optical fiber bundle and improve energy utilization efficiency.The traditional design of an optical system based on imaging optics increases the weight and volume of the system,ultimately affecting the overall performance of system.Therefore,determining the size of the spot and angle of beam convergence is crucial for improving the system- s light energy utilization efficiency.Methods A large aperture Fresnel lens condensing system is designed based on a hybrid design method of imaging and non-imaging optics.The system consists of a 1.1-m-diameter Fresnel lens,a beam homogenizer,a total reflection collimator,and a relay lens group.The receiving surface is a fiber bundle with a diameter of 2 mm and a numerical aperture of 0.22.The problem of traditional large aperture lenses- large volume and weight is solved using large aperture Fresnel lenses.To achieve uniform energy distribution and reduce the convergence angle of the light bundle,the rear group of non-imaging optical elements,composed of a beam homogenizer and a total reflection collimator,are designed to reduce the spherical and chromatic aberrations of large aperture Fresnel lenses.The relay lens group also controls the beam divergence angle and spot size,allowing the optical signal to be efficiently coupled into the optical fiber and improving the light energy utilization efficiency of the system.Results and Discussions First,a large aperture Fresnel lens condensing s

关 键 词：遥感 光学设计 聚光系统 大口径菲涅耳透镜 非成像光学理论 光能利用率 

分 类 号：TH74[机械工程—光学工程]