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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729nm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100mHz/s以内。
The free-running laser reference is locked to a Fabry-Pérot (F-P) reference cavity with vibration isolation, constant temperature and high fineness to obtain narrow linewidth laser with better short-term stability. In order to reduce the influence of temperature on the stability of the laser frequency, the cavity of the F-P cavity is generally selected from a glass material with a coefficient of ultra-low thermal expansion (ULE). ULE glass there is a specific temperature point, the temperature point of its ULE coefficient close to 0, called the inflection point temperature. Because of its inflection point temperature is usually lower or higher than room temperature, so designed a set of active temperature control device, the device can be in a high vacuum FP cavity temperature control in the range of -5 ~ 40 ℃, and one day FP cavity The temperature fluctuation range is within ± 0.005 ℃. The temperature control device can be used in a ULE F-P cavity system operating at a wavelength of 729 nm. When the reference cavity temperature is controlled near the inflection point temperature (17.3 ° C.), the average linear frequency drift is controlled within 100 mHz / s.