量子电子学报, 2009, 26 (1): 23, 网络出版: 2010-05-24
亚稳态氨原子饱和吸收光谱无调制激光稳频
Laser frequency locking based on the saturation absorption line of metastable krypton without frequency dither
激光技术 激光锁频:饱和吸收光谱 频率调制 氧原子:冷原子 laser technique laser frequency locking saturation absorption spectroscopy frequency modulation krypton atom cold atom
摘要
利用亚稳态氧原子2p3/2 5p[5 /2]3 - 2p 3/25s[3/2]2 饱和吸收光谱，分别使用电光调制器相位调制和声光调制器移频调制的方法，结合相敏检测，实现了钦宝石激光器相对于亚稳态氧原子的81 1. 5 nm 饱和吸收线的频率锁定。由获得的鉴频曲线以及误差信号估算，激光频率漂移从稳频回路开路时的超过8 MHz ，减小到回路闭合时的约1 MHz ，并可实现对激光频率数小时的稳定。该稳、频后的激光光源被成功地用于激光冷却亚稳态氧原子各个稳定同位素。
Abstract
The saturation spectroscopy of the 811 nm 2P3/25p[5/2h-2p3/25s[3/2]2 line of metastable krypton atom was used to lock the frequency of a Ti:Sapphire laser. Two kinds of frequency modulation method were utilized, one using an electro-optic phase modulator, the other using an acoustic-optic frequency shifter. When the feed-back loop was closed the frequency drift was reduced to 1 MHz, while it was about 8 MHz when the loop was open. The laser can be frequency stabilized during hours-long measurements and it allows us to realize laser cooling and trapping of the different isotopes of krypton. Key words: laser technique; laser frequency locking; saturation absorption spectroscopy; frequency modulation; krypton atom; cold atom
吴仡；合肥微尺度物质科学国家实验室，中国科学技术大学化学物理系， 安徽合肥230026, 蒋蔚；合肥微尺度物质科学国家实验室，中国科学技术大学化学物理系， 安徽合肥230026, 程存峰；合肥微尺度物质科学国家实验室，中国科学技术大学化学物理系， 安徽合肥230026, 孙羽；合肥微尺度物质科学国家实验室，中国科学技术大学化学物理系， 安徽合肥230026, 成国胜；合肥微尺度物质科学国家实验室，中国科学技术大学化学物理系， 安徽合肥230026, 胡水明；合肥微尺度物质科学国家实验室，中国科学技术大学化学物理系， 安徽合肥230026. 亚稳态氨原子饱和吸收光谱无调制激光稳频[J]. 量子电子学报, 2009, 26(1): 23. WU Yi, JIANG Wei, CHENG Cun-feng, SUN Yu, CHENG Guo-sheng, HU Shui-ming. Laser frequency locking based on the saturation absorption line of metastable krypton without frequency dither[J]. Chinese Journal of Quantum Electronics, 2009, 26(1): 23.
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