Laser stabilization to a cryogenic fiber ring resonator

TL;DR

This paper demonstrates a cryogenic fiber ring resonator with exceptional temperature insensitivity and low sensitivity to environmental disturbances, advancing laser frequency stabilization for precision measurements.

Contribution

The study introduces a fiber-based ring resonator operating at cryogenic temperatures with a unique temperature-insensitive point, surpassing crystalline silicon resonators in stability.

Findings

Achieved a temperature-insensitive point at around 3.55 K.

Low sensitivity to vibrations, temperature, and pressure changes.

Potential for improved laser stabilization in precision experiments.

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.