光学学报, 2014, 34 (5): 0530002, 网络出版: 2014-04-18
采用铷原子射频频率调制光谱与调制转移光谱对1560 nm激光经波导倍频至780 nm进行稳频的比较
Laser Frequency Stabilization of 1560 nm Laser after Frequency Doubling to 780 nm with a Waveguide: Radio-Frequency Frequency-Modulation Spectroscopy versus Modulation Transfer Spectroscopy with Rb Atoms
量子光学 射频频率调制光谱 调制转移光谱 激光稳频 1560 nm光纤通信激光器 倍频 MgO:PPLN倍频波导 quantum optics radio-frequency frequency-modulation spectroscopy modulation transfer spectroscopy laser frequency stabilization 1560 nm optical fiber telecom laser frequency doubling MgO:PPLN frequency doubling waveguide
摘要
采用射频频率调制光谱(RF-FMS)和调制转移光谱(MTS)将1560 nm分布反馈激光器经MgO:PPLN波导高效倍频后锁定于87Rb原子D2线超精细跃迁。比较了两种方法的原理、谱线以及锁频结果。激光器自由运转30 min的典型频率起伏为8~10 MHz，采用RF-FMS和MTS锁频30 min的频率起伏均方根分别为±135 kHz和±85 kHz，这主要是由于后者的信噪比高，谱线完全无背景。采用MTS方案，搭建了一套结构紧凑、性能稳定的1.5 μm光纤通信波段激光稳频系统。
Abstract
By efficient frequency doubling of 1560 nm distributed feed back laser with a MgO:PPLN waveguide, the laser frequency is locked to the D2 hyperfine transition of 87Rb atoms via radio-frequency frequency modulation spectroscopy (RF-FMS) and modulation transfer spectroscopy (MTS). The theories, spectra and frequency locking results of the two schemes are compared. The root mean squares of frequency fluctuation with feedback using the two schemes are ±135 kHz and ±85 kHz, respectively, while it is 8~10 MHz for free running. This is owing to the better signal-to-noise ratio and completely no background for MTS. Utilizing MTS, a compact, robust 1.5 μm laser system for fiber-optic communication application is built.
韩亚帅, 温馨, 白建东, 何军, 王军民. 采用铷原子射频频率调制光谱与调制转移光谱对1560 nm激光经波导倍频至780 nm进行稳频的比较[J]. 光学学报, 2014, 34(5): 0530002. Han Yashuai, Wen Xin, Bai Jiandong, He Jun, Wang Junmin. Laser Frequency Stabilization of 1560 nm Laser after Frequency Doubling to 780 nm with a Waveguide: Radio-Frequency Frequency-Modulation Spectroscopy versus Modulation Transfer Spectroscopy with Rb Atoms[J]. Acta Optica Sinica, 2014, 34(5): 0530002.
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