The frequency stability of lasers is limited by thermal noise in state-of-the-art frequency references. Further improvement requires operation at cryogenic temperature. In this context, we investigate a fiber-based ring resonator. Our system exhibits a first-order temperature-insensitive point around $3.55\,\,{\rm K}$, much lower than that of crystalline silicon. The observed low sensitivity with respect to vibrations (${\lt}5 \cdot {10^{- 11}}\,\,{{\rm m}^{- 1\;}}{{\rm s}^2}$), temperature (${-}22(1) \cdot {10^{- 9}}\,\,{{\rm K}^{- 2}}$), and pressure changes ($4.2(2) \cdot {10^{- 11}}\,\,{{\rm mbar}^{- 2}}$) makes our approach promising for future precision experiments.

中文翻译：

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低温光纤环形谐振器的激光稳定化

激光的频率稳定性受最新频率参考中的热噪声限制。进一步的改进要求在低温下操作。在这种情况下，我们研究了基于光纤的环形谐振器。我们的系统显示出一阶温度不敏感点，约为$ 3.55 \，\，{\ rm K} $，远低于晶体硅。观察到的对振动的低灵敏度（$ {\ lt} 5 \ cdot {10 ^ {-11}} \，\，{{\ rm m} ^ {-1 \;}} {{\ rm s} ^ 2} $），温度（$ {-} 22（1）\ cdot {10 ^ {-9}} \，\，{{\ rm K} ^ {-2}} $）和压力变化（$ 4.2（ 2）\ cdot {10 ^ {-11}} \，\，{{\ rm mbar} ^ {-2}} $）使我们的方法有望用于未来的精密实验。