相关光子自校准微光辐亮度计的光学设计  

Optical Design of a Self-calibrated Low Light Radiance Meter Based on Correlated Photons

作　　者：史佳庆 俞兵[3] 储隽伟 范纪红[3] 胡友勃 李健军 SHI Jiaqing;YU Bing;CHU Junwei;FAN Jihong;HU Youbo;LI Jianjun(Anhui Institute of Optics and Fine Mechanics,Hefei Institute of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;Xi′an Institute of Applied Optics,Xi′an 710065,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所,合肥230031 [2]中国科学技术大学,合肥230026 [3]西安应用光学研究所,西安710065

出　　处：《光子学报》2023年第12期112-125,共14页Acta Photonica Sinica

基　　金：国家重点研发计划(No.2022YFB3903100)。

摘　　要：为满足气候监测、微光辐射计量、单光子计量等定量应用需求,设计了基于相关光子自校准的紧凑型三通道微光辐亮度计,其光谱范围为460~1550nm,辐亮度测量范围为1×10^(-9)~1×10^(-6)W/(cm^(2)·sr·nm)。设计时考虑整机的集成化、小型化和模块化,将8个光谱波段集成为三通道结构。其中可见光近红外波段采用自由空间耦合,短波红外波段采用多模光纤耦合方式。通过设计优化分析,微光辐亮度计的第一、二通道的聚焦光斑满足Si单光子探测器光敏面300μm像元要求,第三通道的聚焦光斑满足多模光纤62.5μm芯径和0.22数值孔径要求,三个通道的聚焦光斑均可被单光子探测器光敏面接收,满足设计目标,可为后续的工程化应用提供参考。The high-precision self-calibration radiation reference source is currently the research focus of satellite remote sensing calibration.In order to meet the requirements of quantitative applications such as climate monitoring,low-light radiation metering and single photon source radiance measurement,in view of the application requirements and technical requirements of visible to near infrared low-light radiometer,a compact three-channel low-light radiance meter based on correlated photon self-calibration is designed.This design method can improve the measurement accuracy of low light irradiance by using objective physical effect instead of physical standard,reducing the cumulative error caused by standard transfer chain.The absolute calibration of the detector responsivity can be achieved by the spontaneous parameter downconversion effect,and the absolute radiation observation can be achieved without relying on the external reference.Based on this study,combined with the special application requirements of radiance meter,a numerical model of spectral rate and geometric transmission characteristics of wide spectrum correlated photons is established,and two basic operating modes of self-calibration and radiation observation are determined.The interaction between 355 nm pump source and nonlinear medium generates three-wave mixing,and the correlated photons are generated by class I non-collinear spontaneous parametric downconversion,the combined effect of monochromatic pump photon flow and quantum vacuum noise on non-centrosymmetric nonlinear crystal makes each incident photon spontaneously split into two photons with lower energy with a certain probability,called signal photons and idle photons respectively,they have a wide sptrum distribution from pump wave frequency to lattice resonance frequency.Correlated photon source has the technical characteristics of time and space correlation,natural wide spectrum and absolute reproducibility,so it has high absolute accuracy.Integrated design of self-calibration and radiati

关 键 词：辐射定标 辐亮度计 光学设计 相关光子 微光 

分 类 号：TP732[自动化与计算机技术—检测技术与自动化装置]