Dynamic range expansion for optical frequency shift detection based on multiple harmonics  

作　　者：周彦汝 樊李凡 徐凯 刘文耀 邢恩博 唐军 刘俊 Yanru Zhou;Lifan Fan;Kai Xu;Wenyao Liu;Enbo Xing;Jun Tang;and Jun Liu(State Key Laboratory of Dynamic Measurement Technology,North University of China,Taiyuan 030051,China;School of Information&Communication Engineering,North University of China,Taiyuan 030051,China;School of Instrument&Electronics,North University of China,Taiyuan 030051,China)

机构地区：[1]State Key Laboratory of Dynamic Measurement Technology,North University of China,Taiyuan 030051,China [2]School of Information&Communication Engineering,North University of China,Taiyuan 030051,China [3]School of Instrument&Electronics,North University of China,Taiyuan 030051,China

出　　处：《Chinese Optics Letters》2024年第4期42-47,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(No.52305621);Foundation Research Project of Shanxi Province(No.202203021212156);Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement(No.201905D121001002)。

摘　　要：Sensors based on optical resonators often have their measurement range limited by their cavity linewidth,particularly in the measurement of time-varying signals.This paper introduces a method for optical frequency shift detection using multiple harmonics to expand the dynamic range of sensors based on optical resonators.The proposed method expands the measurement range of optical frequency shift beyond the cavity linewidth while maintaining measurement accuracy.The theoretical derivation of this method is carried out based on the equation of motion for an optical resonator and the recursive relationship of the Bessel function.Experimental results show that the dynamic range is expanded to 4 times greater than the conventional first harmonic method while still maintaining accuracy.Furthermore,we present an objective analysis of the correlation between the expansion factor of the method and the linewidth and free spectrum of the optical resonator.

关 键 词：optical resonator optical frequency shift multiple harmonics dynamic range expansion 

分 类 号：O43[机械工程—光学工程] TN751.2[理学—光学]