激光与光电子学进展, 2017, 54 (3): 031401, 网络出版: 2017-03-08
基于制冷法布里-珀罗腔的激光频率漂移控制 下载: 663次
Laser Frequency Drift Control Based on Refrigeration Fabry-Pérot Cavity
激光光学 频率稳定性 窄线宽激光 拐点温度 频率漂移 laser optics frequency stability narrow linewidth laser inflection point temperature frequency drift
摘要
将自由运转的激光器参考锁定在隔振、恒温、高细度的Fabry-Pérot (F-P)参考腔上,获得了短期稳定性频率较好的窄线宽激光。为了降低温度对激光频率稳定性的影响,F-P腔的腔体一般选用具有超低热膨胀(ULE)系数的玻璃材料。ULE玻璃存在一个特定的温度点,该温度点下其ULE系数接近0,称之为拐点温度。由于其拐点温度通常低于或者高于室温,因此设计了一套主动温控装置,该装置可在高真空环境中将F-P腔的温度控制在-5~40 ℃范围内,并且一天内F-P腔的温度波动范围在±0.005 ℃以内。该温度控制装置可应用在工作波长为729 nm的ULE F-P腔系统中,当该参考腔的温度控制在拐点温度(17.3 ℃)附近时,平均线性频率漂移控制在100 mHz/s以内。
Abstract
In order to obtain a narrow linewidth laser with good short-term frequency stability, a free running laser is locked in a Fabry-Pérot (F-P) reference cavity which has the characteristics of vibration isolation, constant temperature and high fineness. To reduce the influence of temperature on laser frequency stability, the F-P cavity is generally made of glass material with ultralow-expansion (ULE) coefficient. There is a special temperature point called inflection point temperature for ULE glass, and the ULE coefficient of glass is almost zero under such special temperature. For the inflection point temperature is always higher or lower than the room temperature, we design an active temperature control equipment which can control the F-P cavity temperature in the range of -5-40 ℃ in high vacuum environment, with a temperature fluctuation less than ±0.005 ℃ in one day. The temperature control equipment is employed to ULE F-P cavity system with the working wavelength of 729 nm, and the average linear frequency drift is within 100 mHz/s when the reference cavity temperature is controlled near the inflection point temperature of 17.3 ℃.
汪绍茂, 商俊娟, 崔凯枫, 张平, 晁思嘉, 袁金波, 曹建, 舒华林, 黄学人. 基于制冷法布里-珀罗腔的激光频率漂移控制[J]. 激光与光电子学进展, 2017, 54(3): 031401. Wang Shaomao, Shang Junjuan, Cui Kaifeng, Zhang Ping, Chao Sijia, Yuan Jinbo, Cao Jian, Shu Hualin, Huang Xueren. Laser Frequency Drift Control Based on Refrigeration Fabry-Pérot Cavity[J]. Laser & Optoelectronics Progress, 2017, 54(3): 031401.