Characterization of the absolute frequency stability of an individual reference cavity

TL;DR

This paper introduces a novel method for characterizing the absolute frequency stability of individual reference cavities by cross-beating three laser beams, enabling detailed analysis beyond traditional beatnote measurements.

Contribution

The paper presents a new technique for measuring the absolute frequency stability of reference cavities, providing more detailed insights than conventional methods.

Findings

First-time characterization of absolute frequency stability of three cavities

Method reveals individual cavity features not accessible by traditional beatnote

Potential applications in optimizing optical clockwork performance

Abstract

We demonstrated for the first time the characterization of absolute frequency stability of three reference cavities by cross beating three laser beams which are independently locked to these reference cavities. This method shows the individual feature of each reference cavity, while conventional beatnote measurement between two cavities can only provide an upper bound. This method allows for numerous applications such as optimizing the performance of the reference cavity for optical clockwork.