基于纳米光纤的光学法布里-珀罗谐振腔腔内模场的表征  

Characterization of mode field distribution in optical Fabry-Perot cavity based on nanofiber

作　　者：胡裕栋 宋丽军[1] 王晨曦 张沛 周静 李刚[1,2] 张鹏飞 张天才[1,2] Hu Yu-Dong;Song Li-Jun;Wang Chen-Xi;Zhang Pei;Zhou Jing;Li Gang;Zhang Peng-Fei;Zhang Tian-Cai(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,太原030006 [2]山西大学,极端光学协同创新中心,太原030006

出　　处：《物理学报》2022年第23期262-268,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:U21A6006,U21A20433,11974223,11974225,12104277,12104278);山西省“1331工程”重点学科建设基金资助的课题.

摘　　要：光学法布里-珀罗(F-P)谐振腔、粒子、微纳机械振子三者结合的复合腔光力学系统在基本物理问题、量子信息、精密测量等方面的研究和应用中越来越引起大家的重视.本文将纳米光纤置于光学F-P谐振腔的腔模中,探究了纳米光纤对光学F-P谐振腔精细度的影响,并通过测量纳米光纤引起的光学F-P谐振腔内腔损耗随纳米光纤位置的关系直接获得光学F-P谐振腔的腰斑半径,从而进一步实现了对光学F-P谐振腔腔内模场分布的无损表征.此方法可以用于在纳米光纤表面装载的发光粒子与光学F-P谐振腔耦合的精确控制,也为集合光子、粒子、声子的复合腔光力学研究提供了良好的平台.The composite cavity optomechanical system combining optical Fabry-Perot(F-P)cavities,particles,and micro/nano mechanical oscillators is becoming more significant in the researches and applications of the fundamental physics,quantum information processing,and precision measurement.Characterizing the mode field distribution of optical F-P cavity is significant prior to the application of optical F-P cavity.In this paper,we propose and demonstrate a method to measure the waist of an optical F-P cavity and to characterize the mode field distribution of the optical F-P cavity by using a nanofiber nondestructively.In experiment,a nanofiber is placed in the mode of the optical F-P cavity with a fineness of around 1500.The optical F-P cavity is composed of two mirrors each with high reflectivity of 99.8%.The radius of curvature of the each mirror is 50 mm.The cavity length is(80±4)mm.The nanofiber is fabricated from a single-mode fiber by the flame-brush method.The nanofiber diameter is around 440 nm.The transmission spectra of the optical F-P cavity are measured by scanning the cavity length.The free spectrum ranges and the inner cavity losses can be obtained from the transmission spectra.First,the influence of the nanofiber on the optical F-P cavity fineness is investigated.The fineness as a function of nanofiber position along the radial direction of the optical F-P cavity is measured.The fineness caused by the nanofiber decreases to a minimum value of about 240.Second,it is investigated that the optical F-P cavity inner loss caused by the nanofiber as a function of the nanofiber position along the radial direction of the optical F-P cavity when the nanofiber is placed at the waist of the optical F-P cavity.The inner loss of the optical F-P cavity caused by the nanofiber is related to the intensity distribution of the optical F-P cavity mode field,which is predicted theoretically.Thus,by making the Gaussian fitting of the optical F-P cavity inner loss as a function of the nanofiber position,we can obtain a waist rad

关 键 词：腔量子电动力学 纳米光纤 光学F-P谐振腔 腰斑 

分 类 号：TN253[电子电信—物理电子学]