Ultrahigh long-term dimensional stability of a sapphire cryogenic optical resonator.
Ultrahigh long-term dimensional stability of a sapphire cryogenic optical resonator.
复制标题
蓝宝石低温光学谐振器的超高长期尺寸稳定性。
作者：
R. Storz;C. Braxmaier;K. Jäck;O. Pradl;S. Schiller
报道了一种冷却到液氦温度的晶体低温光学谐振腔(芯)的超高长期尺寸稳定性。与独立的激光系统进行了长时间的比较，倍频后的激光在532 nm处稳定在分子碘的超精细谱线上。在6个月的时间里，漂移小于3 kHz。因此，在室温下，芯体的尺寸稳定性比最好的超低膨胀玻璃陶瓷腔高出两个数量级以上。
We report on the ultrahigh long-term dimensional stability of a crystalline cryogenic optical resonator (CORE) cooled to liquid-helium temperature. The frequency of a Nd:YAG laser stabilized to a CORE was compared over long times with an independent laser system, a frequency-doubled Nd:YAG laser stabilized to a hyperfine line of molecular iodine at 532 nm. Over a 6-month period the drift was less than 3 kHz. The dimensional stability of the CORE is thus more than 2 orders of magnitude higher than that of the best ultralow-expansion glass ceramic cavities at room temperature.