Fabry-Perot-based phase demodulation of heterodyne light-induced thermoelastic spectroscopy  

作　　者：Ziting Lang Shunda Qiao Yufei Ma 

机构地区：[1]National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,92 Xidazhih Street,Nangang District,Harbin 150000,Heilongjiang Province,China [2]Zhengzhou Research Institute,Harbin Institute of Technology,Zhengzhou 450000,China

出　　处：《Light(Advanced Manufacturing)》2023年第3期233-242,共10页光（先进制造）（英文）

基　　金：support from the National Natural Science Foundation of China(Grant Nos.62022032,62275065,61875047,61505041);the Key Laboratory of Opto-Electronic Information Acquisition and Manipulation(Anhui University);the Ministry of Education(Grant No.OEIAM202202);the Fundamental Research Funds for Central Universities.

摘　　要：Fabry-Perot(F-P)-based phase demodulation of heterodyne light-induced thermoelastic spectroscopy(H-LITES)was demonstrated for the first time in this study.The vibration of a quartz tuning fork(QTF)was detected using the F-P interference principle instead of an electrical signal through the piezoelectric effect of the QTF in traditional LITES to avoid thermal noise.Given that an Fabry-Perot interferometer(FPI)is vulnerable to disturbances,a phase demodulation method that has been demonstrated theoretically and experimentally to be an effective solution for instability was used in H-LITES.The sensitivity of the F-P phase demodulation method based on the H-LITES sensor was not associated with the wavelength or power of the probe laser.Thus,stabilising the quadrature working point(Q-point)was no longer necessary.This new method of phase demodulation is structurally simple and was found to be resistant to interference from light sources and the surroundings using the LITES technique.

关 键 词：Fabry-Perot(F-P)interferometer(FPI) Phase demodulation Light-induced thermoelastic spectroscopy(LITES) Thermal noise 

分 类 号：O657.3[理学—分析化学]