基于分时复用非线性Stokes层析的偏振分辨上转换探测(特邀)  

Polarization-resolved upconversion detection enabled by time-division multiplexed nonlinear spatial Stokes tomography(invited)

作　　者：赵文潇 姜嘉琪 李春宇 赵波 王爱丽[1] 吴海滨[1] 朱智涵 ZHAO Wenxiao;JIANG Jiaqi;LI Chunyu;ZHAO Bo;WANG Aili;WU Haibin;ZHU Zhihan(College of Measurement and Control Technology and Communication Engineering,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学测控技术与通信工程学院,黑龙江哈尔滨150080

出　　处：《红外与激光工程》2024年第12期1-7,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(12474324,62075050,11934013);黑龙江省重点研发计划项目(JD2023SJ19);黑龙江省自然科学基金项目(LH2023F034,LH2022A016)。

摘　　要：偏振分辨的上转换探测技术旨在充分利用红外组件高物理分辨率与可见面阵探测器高灵敏与高响应特性,以实现紧凑、稳定的偏振分辨上转换探测系统。该系统需在上转换过程中同时获取目标物体的强度及偏振维度信息,从而提升目标探测的细节及可视度,改善传统上转换探测在复杂环境中的图像亮度灰暗及信息丢失问题。然而由于光参量过程的偏振依赖性,偏振分辨上转换系统往往需要引入额外光学结构,这极大限制了系统的紧凑性及成像分辨率。为此,提出并实验论证了一种基于电控可调延迟器的分时复用非线性Stokes层析方案——利用电控可调延迟器毫秒级响应速度与光参量过程中天然的偏振选择性,以分时方式构建偏振分辨上转换探测系统。该方案无需复杂光机结构、无任何机械运动装置且可充分利用可见探测器的空间分辨率。该研究为基于红外偏振分辨成像技术的相关研究提供了一条切实可行的新型技术路线。Objective Upconversion infrared(IR)detection,a method leveraging nonlinear parametric upconversion,effectively upconverts the signal beam spectrum from the IR to the visible band,thus enabling the indirect detection of targets using silicon-based detectors or cameras.However,like most traditional imaging technologies,in practical applications,the scattering and reflection of light caused by fine particles can lead to issues such as gray images and information loss.This limits the application range of this technology.Polarization imaging detection can extract the polarization of the target based on the polarization difference between the target and background light.This allows for obtaining more information independent of intensity and spectrum,thus avoiding the shortcomings of traditional detection imaging technology.It also helps weaken background noise,improve detection and recognition ability,and has a wide range of applications in target detection classification,three-dimensional target reconstruction,and biomedicine.Therefore,combining upconversion with polarization detection technology is an important technical means to accelerate the development of infrared detection technology.This study proposes and experimentally validates a time-division multiplexed nonlinear Stokes tomography scheme based on an electrically controlled Variable Retarder(VR),with a focus on the structural design of a polarization-resolved upconversion detection system.The proposed system functions as a time-division Stokes upconversion tomography device,operating through a cyclic process involving"VR delay control—signal triggering—data acquisition."The electrically controlled liquid crystal VR,with millisecond-level response time,sequentially transmits the different polarization Stokes components of the signal light field into a bulk quasi-phase matchings crystal for efficient frequency upconversion.Ultimately,a visible array detector performs time-division sampling to reconstruct the polarization image.This scheme does not require

关 键 词：上转换探测 偏振分辨 分时复用 空间Stokes层析 可调延迟器 

分 类 号：O436[机械工程—光学工程]