田晓.用于原子冷却的激光与窄带光学腔优化匹配[J].光电子激光,2019,(7):692~696
用于原子冷却的激光与窄带光学腔优化匹配
Research on optimized mode matching between atomic cooling laser and ring optical cavity with narrow linewidth
投稿时间:2019-01-28  
DOI:
中文关键词:  激光技术  模式匹配  匹配透镜  频率锁定参考
英文关键词:laser technique  mode matching  matching lens  stabilizing frequency reference
基金项目:西安航空学院博士及高层人才科研启动基金资助项目 (西安航空学院 理学院,陕西 西安 710077)
作者单位
田晓 西安航空学院 理学院,陕西 西安 710077 
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中文摘要:
      采用光学腔对用于原子冷却的窄线宽激光频率稳 定非常重要。本文提出一种三镜结构的环形光学谐 振腔,基于入射激光与该腔的模式优化匹配,获得了线宽小于1MHz的稳频参考。首先通过 基模高斯光束 在空间的传播规律得到激光腰斑大小100 μm,并基于光学矩阵变换 规律得到该环形腔的光腰尺寸为247.6 μm 且位于两平面反射镜之间,然后通过高斯光束通过透镜的腰斑变换规律,提出采用焦距186 mm,且位于距 离光学腔光腰位置382 mm的匹配透镜实现两者的优化匹配。通过实验 ,最终获得线宽0.7 MHz的腔透射信 号,也即锁频参考线,相比较于200 mm两镜短腔1.5 MHz的线宽,具 有明显优势。对激光与环形光学谐振腔的优化匹配研究有利于冷却激光线宽的优化工作。
英文摘要:
      Optical cavity is the very important component of frequency stabilizin g laser.The laser with narrow line-width is suitable for efficient cooling atoms,high-precision spectroscop y and accurately measurement.In the paper,a three-mirror ring optical resonator is proposed,in order to optimize the performance of our diode laser.On the basis of optimized mode matching between the incident laser and the cavity, a frequency reference for locking the laser is researched.Firstly,the laser waist spot size of 100μm is obtaine d by the propagation law of the fundamental mode Gaussian beam in space.Based on the optical matrix transformat ion law,the optical waist size of the ring cavity is 247.6μm,and it lies between two planar mirrors.Secondl y,according to the waist transformation rule of Gaussian beam passing through lens,a matching lens is pr oposed.Its focal length is 186mm and its waist position of 382mm away from the optical waist of the cavity.T hen this lens is applied to realize the optimal match between laser beam and the ring cavity.The experimental resul t shows that the line-width of transmission signal is 0.7MHz.Compared with the 200mm length short cavity with linewidth 1.5MHz,the result above is better and illustrates the superior performance of the ring cavity.The research on the optimal matching between laser and ring optical resonator is beneficial to the further optimizati on of laser linewidth.
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