Noise canceled graphene-microcavity fiber laser sensor for ultrasensitive gas detection  

作　　者：YUCHEN WANG YIWEI LI YICHENG LI HAO ZHANG ZIHAN LIU YANHONG GUO ZEPING WANG JUN HE XUHAN GUO YIPING WANG BAICHENG YAO 

机构地区：[1]Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education),University of Electronic Science and Technology of China,Chengdu 610054,China [2]Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors,Shenzhen University,Shenzhen 518060,China [3]State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Photonics Research》2023年第8期I0003-I0011,共9页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2021YFB2800602);National Natural Science Foundation of China(61975025,U2130106);State Key Laboratory Open Program(2022GZKF002)。

摘　　要：Optical microcavities offer a promising platform for highly efficient light–matter interactions.Recently,the combination of microresonators and 2D materials in the nanoscale has further enriched the optoelectronics of microcavity geometries,spurring broad advances including lasers,nonlinear converters,modulators,and sensors.Here,we report the concept of compact dual-laser cogeneration in a graphene-microcavity fiber,which offers a way to cancel the optical common mode noises.Driven by a single 980 nm pump,orthogonally polarized laser lines are generated in a pair of degeneracy breaking modes.The two laser lines produce a heterodyne beat note at 118.96 MHz,with frequency noise down to 200 Hz~2∕Hz at 1 MHz offset,demonstrating a linewidth of 930 Hz in vacuum.This compact device enables on-line and label-free NH_(3) gas detection with high resolution,realizing a detection limit on a single pmol/L level,and a capability to quantitatively trace gas–graphene interactions.Such a combination of graphene optoelectronics and microcavity photonics demonstrates a novel physical paradigm for microlaser control and offers a new scheme for in situ chemical sensing.

关 键 词：FIBER laser PUMP 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]