光学锁相环的实现及其在铯原子四波混频过程中的应用  

Realization of Optical Phase-locked Loop and Its Application in Four-wave Mixing Process in Cesium Vapor

作　　者：马荣[1,2] 刘伟 秦忠忠[1,2] 李凤琴 MA Rong;LIU Wei;QIN Zhong-zhong;LI Feng-qin(State Key Laboratory of Quantum Optics and Quantum Optics Devices,and Institute of Opto-Electronics,Shanxi University,Tai Yuan 030006,Chin;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,山西太原030006 [2]山西大学极端光学协同创新中心,山西太原030006

出　　处：《量子光学学报》2018年第3期343-348,共6页Journal of Quantum Optics

基　　金：国家自然科学基金(61601270);山西省应用基础研究计划(201601D202006);国家重点基础研究发展计划(2016YFA0301402);山西省“1331工程”重点学科建设计划经费

摘　　要：我们利用自制的光学锁相环实现了一台外腔半导体激光器和一台钛宝石激光器的相对频率和相对相位锁定,锁定后两束光的拍频线宽约为1 Hz。同时,该光学锁相环能实现两台激光器从10 MHz至10GHz任意频率差的锁定,通过简单升级射频元件可以实现最高20 GHz频率差的锁定,可应用于激光冷却与俘获原子、光与原子相互作用等研究领域。我们实验证明将该锁相环应用于铯原子蒸汽中的四波混频过程,产生的孪生光束最大强度差压缩由3.8dB提高至6.0dB。We demonstrate the relative frequency and phase locking of an external cavity diode laser and a Ti：sapphire laser by using our home-made optical phase-locked loop（OPLL）.The beat linewidth of the Ti：sapphire laser and the diode laser is around 1 Hz.The OPLL can also realize the phase locking at frequency differences ranging from 10 MHz to 10 GHz and even up to 20 GHz by simply upgrading the radio frequency devices.It can be applied to the laser cooling and trapping of atoms and light-atom interactions.Our experiment shows that when the phase-locked loop is used to the four-wave mixing process in cesium vapor,the maximum intensity-difference squeezing of the twin beams increases from 3.8 dB to 6.0 dB.

关 键 词：光学锁相环 拍频线宽 强度差压缩 

分 类 号：O437[机械工程—光学工程]