Highly sensitive mid-infrared upconversion detection based on external-cavity pump enhancement  

作　　者：Xiaohan Liu Kun Huang Wen Zhang Ben Sun Jianan Fang Yan Liang Heping Zeng 

机构地区：[1]East China Normal University,State Key Laboratory of Precision Spectroscopy,Shanghai,China [2]Chongqing Institute of East China Normal University,Chongqing Key Laboratory of Precision Optics,Chongqing,China [3]Shanxi University,Collaborative Innovation Center of Extreme Optics,Taiyuan,China [4]University of Shanghai for Science and Technology,School of Optical Electrical and Computer Engineering,Shanghai,China [5]Shanghai Research Center for Quantum Sciences,Shanghai,China [6]Chongqing Institute for Brain and Intelligence,Guangyang Bay Laboratory,Chongqing,China

出　　处：《Advanced Photonics Nexus》2024年第4期28-35,共8页先进光子学通讯（英文）

基　　金：supported by the National Key Research and Development Program(Grant No.2021YFB2801100);the National Natural Science Foundation of China(Grant Nos.62175064,62235019,62035005,and 12022411);the Shanghai Pilot Program for Basic Research(Grant No.TQ20220104);the Natural Science Foundation of Chongqing(Grant Nos.CSTB2023NSCQ-JQX0011,CSTB2022NSCQ-MSX0451,and CSTB2022NSCQ-JQX0016);the Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01);the Fundamental Research Funds for the Central Universities.

摘　　要：Sensitive mid-infrared(MIR)detection is in high demand in various applications,ranging from remote sensing,infrared surveillance,and environmental monitoring to industrial inspection.Among others,upconversion infrared detectors have recently attracted increasing attention due to their advantageous features of high sensitivity,fast response,and room-temperature operation.However,it remains challenging to realize high-performance passive MIR sensing due to the stringent requirement of high-power continuouswave pumping.Here,we propose and implement a high-efficiency and low-noise MIR upconversion detection system based on pumping enhancement via a low-loss optical cavity.Specifically,a singlelongitudinal-mode pump at 1064 nm is significantly enhanced by a factor of 36,thus allowing for a peak conversion efficiency of up to 22%at an intracavity average power of 55 W.The corresponding noise equivalent power is achieved as low as 0.3 fW∕Hz^(1∕2),which indicates at least a 10-fold improvement over previous results.Notably,the involved single-frequency pumping would facilitate high-fidelity spectral mapping,which is particularly attractive for high-precision MIR upconversion spectroscopy in photonstarved scenarios.

关 键 词：infrared detection single-photon detection upconversion detection 

分 类 号：TN2[电子电信—物理电子学]