面向小型化窄线宽激光的光学锁定硬件系统研究  

Research on optical locking hardware system for miniaturized narrow linewidth laser

作　　者：李代富 包福兵 辛云飞 张诚 韩琪娜 施杨 周琨荔 王瑾 潘奕捷 屈继峰[2] LI Daifu;BAO Fubing;XIN Yunfei;ZHANG Cheng;HAN Qina;SHI Yang;ZHOU Kunli;WANG Jin;PAN Yijie;QU Jifeng(College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China;Center for Advanced Measurement Science,National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018 [2]中国计量科学研究院前沿计量科学中心,北京100029

出　　处：《光学技术》2024年第4期419-424,491,共7页Optical Technique

基　　金：国家重点研发计划项目(2022YFF0608304);国家自然科学基金(62075206,62205324)。

摘　　要：研制小型化、数字化、高带宽的光学锁相控制系统是实现面向实际应用的小型化窄线宽激光光源的关键。但目前的通用及专用型系统存在着诸如依靠商业平台、带宽不足、集成化程度不高等问题。研究研制的数字伺服系统基于现场可编程门阵列(FPGA)以及高速模数转换器(ADC)与数模转换器(DAC),实现数字综合器、调制器、鉴相器、滤波器以及伺服控制单元,成功研制高速、可重构、双通路的光学锁相环集成硬件平台,系统开环带宽为2.63MHz。与具有高品质因子特性的回音壁模式(WGM)光学微腔相结合,通过相位调制光外差稳频方法(PDH)实现积分线宽为20Hz的窄线宽激光,光学闭环反馈带宽达到450M。该系统具有良好的通用性与扩展性,可以适用于各种原子分子光谱以及光学频率的伺服锁定。The development of a miniaturized,digital,and high-bandwidth optical phase-locked control system is the key to realizing miniaturized narrow linewidth laser light sources for practical applications.However,current general-purpose and special-purpose systems have problems such as relying on commercial platforms,insufficient bandwidth,and low integration.The digital servo system developed is based on field programmable gate array(FPGA)and high-speed analog-to-digital converter(ADC)and digital-to-analog converter(DAC)to implement digital synthesizer,modulator,phase detector,filter and servo Control unit,successfully developed a high-speed,reconfigurable,dual-channel optical phase-locked loop integrated hardware platform,with a system open-loop bandwidth of 2.63MHz.Combined with the whispering gallery mode(WGM)optical microcavity with high quality factor characteristics,a narrow linewidth laser with an integral linewidth of 20Hz is achieved through the phase modulation optical heterodyne frequency stabilization method(PDH),and the optical closed-loop feedback bandwidth reaches 450kHz.The system has good versatility and scalability,and can be applied to servo locking of various atomic and molecular spectra and optical frequencies.

关 键 词：窄线宽激光 现场可编程门阵列 光学锁相环 回音壁模式光学微腔 

分 类 号：TH741[机械工程—光学工程]