Laser stabilization to a cryogenic fiber ring resonator

Abstract

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 $3.55$ K, much lower than that of crystalline silicon. The observed low sensitivity with respect to vibrations ($<5\cdot 10^{-11}{\text{m}}^{-1}{\text{s}}^2$), temperature ($-22(1)\cdot 10^{-9}{\text{K}}^{-2}$) and pressure changes ($4.2(2)\cdot 10^{-11}{\text{mbar}}^{-2}$) makes our approach promising for future precision experiments.

References in corpus (2)

• An ultrastable silicon cavity in a continuously operating closed-cycle cryostat at 4 K
• Laser frequency stabilization based on steady-state spectral-hole burning in Eu${}^{3+}$:Y${}_2$SiO${}_5$