铯原子D_(2)线饱和吸收谱稳频半导体激光器  

Frequency-stabilized laser diode based on the saturated absorption spectrum of Cs D_(2)line

作　　者：叶瀚礼 高俊 王新龙 池皓 陈炯[1] 崔索超[1] 耿安兵[1] YE Hanli;GAO Jun;WANG Xinlong;CHI Hao;CHEN Jiong;CUI Suochao;GENG Anbing(Huazhong Institute of Electro-Optics,Wuhan 430200,China)

机构地区：[1]华中光电技术研究所,武汉430200

出　　处：《激光技术》2025年第2期245-249,共5页Laser Technology

基　　金：国防基础科研计划资助项目(JCKYxxx071)。

摘　　要：半导体激光器在自由运转过程中容易受到温度、振动等外界因素的影响,输出激光的频率稳定性难以满足量子精密测量、高精度光谱、激光通信等领域的技术要求。为了获得频率稳定的输出激光,设计了一种稳频半导体激光器。基于133 Cs原子D 2线的超精细能级结构特性和饱和吸收原理,将62S_(1/2),F=4〉→62P_(3/2),F′=5〉饱和吸收峰对应的原子跃迁频率作为参考标准,采用反馈控制的方法实现了输出激光频率闭环锁定。结果表明,闭环锁定下秒级频率稳定度达3.88×10^(-12),积分时间16 s时频率稳定度最低达1.70×10^(-12),12 h拍频信号波动小于140 kHz,线宽为438.41 kHz@10μs,12 h功率稳定性为6.11×10^(-4),整机体积为9×10^(3)cm^(3);饱和吸收光谱和反馈控制的共同作用可以大幅度减小半导体激光器自由运转时的频率波动。该激光器频率稳定度等部分关键指标达到较高水平,实现小型化并长期稳定运行,能够满足量子测量等应用领域对频率锁定激光光源的技术要求。Laser diode were easily affected by temperature,vibration and other external factors during free-running operation,and the frequency stability of the output laser was difficult to meet the technical requirements of the fields such as quantum precision measurement,high-precision spectroscopy and laser communication.In order to obtain output laser with stable frequency,a frequency-stabilized laser diode was designed,which was constructed based on the ultra precision energy level structure of the D 2 transition line of 133 Cs atoms and the principle of saturated absorption.The atomic transitionline of 62S_(1/2),F=4〉→62P_(3/2),F′=5〉was taken as the reference standard of the frequency locked loop(FLL).The results show that,the out-put laser frequency was stabilized by feedback control method.The frequency stability is measured to be 3.88×10^(-12) at the integration time of 1 s,and the lowest frequency stability is 1.70×10^(-12) at the integration time of 16 s.The long-term frequency fluctuation of 12 h is less than 140 kHz measured from the beat frequency signal.The linewidth is 438.41 kHz@10μs.The responding rms power stability is 6.11×10^(-4).The volume of the whole device is 9×103 cm 3.The combination of saturated absorption spectroscopy and feedback control can significantly reduce the frequency fluctuation of free-running semiconductor lasers.The laser has good performance in some key indicators such as frequency stabilization.It has been miniaturized,which makes it easy to move and maintain.And it operates stably for a long time and is capable of meeting the technical requirements for frequency-locked laser light sources in applications such as quantum measurements.

关 键 词：激光器 半导体激光器 饱和吸收 频率稳定 

分 类 号：TN248.4[电子电信—物理电子学]