Random Raman Fiber Laser as a Liquid Refractive Index Sensor  

作　　者：Bing HAN Yuxi MA Han WU Yong ZHAO 

机构地区：[1]College of Information Science and Engineering,Northeastern University,Shenyang 110819,China [2]Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology,Qinhuangdao 066004,China [3]College of Electronics and Information Engineering,Sichuan University,Chengdu 610064,China

出　　处：《Photonic Sensors》2024年第1期13-22,共10页光子传感器（英文版）

基　　金：This work is supported by the Natural Science Foundation of HebeiPi rovincee(GranttNos.F2023501008 and F2020501040);the Fundamental Research Funds for the Central Universities(Grant No.N2323017);the National Natural Science Foundation of China(Grant No.62005186);the Engineeringg Featured Team Fund of Sichuan University(Grant No.2020SCUNG105).

摘　　要：In this paper,a new concept of forward-pumped random Raman fiber laser(RRFL)-based liquid refractive index sensing is proposed for the first time.For liquid refractive index sensing,the flat fiber end immersed in the liquid can act as the point reflector for generating random fiber lasing and also as the sensing head.Due to the high sensitivity of the output power of the RRFL to the reflectivity provided by the point reflector in the ultralow reflectivity regime,the proposed RRFL is capable of achieving liquid refractive index sensing by measuring the random lasing output power.We theoretically investigate the effects of the operating pump power and fiber length on the refractive index sensitivity for the proposed RRFL.As a proof-of-concept demonstration,we experimentally realize high-sensitivity half-open short-cavity RRFL-based liquid refractive index sensing with the maximum sensitivity and the sensing resolution of-39.88W/RIU and 2.5075×10^(-5) RIU,respectively.We also experimentally verify that the refractive index sensitivity can be enhanced with the shorter fiber length of the RRFL.This work extends the application of the random fiber laser as a new platform for highly-sensitive refractive index sensing in chemical,biomedical,and environmental monitoring applications,etc.

关 键 词：Fiber optic sensors refractive index measurements fiber lasers Rayleigh scattering stimulated Raman scattering 

分 类 号：TN248[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]