基于法布里-珀罗腔的激光模式分析  

Laser mode analysis based on a Fabry-Perot cavity

作　　者：赵健 翟雨欣 职佳文 叶艳霞 吴浩煜 张洁[1,2] ZHAO Jian;ZHAI Yu-xin;ZHI Jia-wen;YE Yan-xia;WU Hao-yu;ZHANG Jie(MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics,PGMF and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学物理学院基础物理量测量教育部重点实验室,湖北武汉430074 [2]华中科技大学物理学院引力与量子物理湖北省重点实验室,湖北武汉430074

出　　处：《物理实验》2022年第1期10-14,共5页Physics Experimentation

基　　金：国家自然科学基金项目(No.61805092);国家重点研发计划项目(No.2020YFC2200402)

摘　　要：法布里-珀罗腔(F-P)通常是由2面平行放置的反射镜组成的多光束干涉仪,将入射光束耦合进入F-P腔,光场会在反射镜间多次来回反射,经过干涉相长过程光场被增强,形成稳定腔内光场.为帮助学生更好地理解多光束干涉与谐振腔内模式产生的工作原理,基于F-P腔设计了可分辨激光模式的实验装置,探究不同激光模式的输出特性.通过实验观察拉盖尔-高斯光束,测量了F-P腔的自由光谱区、相邻横模频率间隔等参量,并分析了主要的实验误差来源.Fabry-Perot(F-P)cavity is a multi-beam interferometer consisting of two parallel highreflection mirrors.When the incident beam is coupled into the F-P cavity,the light field will be reflected back and forth many times between the two mirrors.The light field is in tune enhanced through constructive interference to form a stable light field inside the F-P cavity.In order to help students easily understand the working principle of multi-beam interference and mode generation in a resonator,an experimental apparatus based on the F-P cavity was designed to identify Laguerre-Gaussian modes,which were observed by laser frequency tuning.Some important parameters of the F-P cavity,such as the free-spectral range and the frequency interval of two adjacent transverse modes,were measured.The main sources of experimental errors were analyzed.

关 键 词：法布里-珀罗腔 拉盖尔-高斯模式 自由光谱区 激光模式 

分 类 号：O4-34[理学—物理]