Optical frequency metrology with a Rb-stabilized ring-cavity resonator -- Study of cavity-dispersion errors

TL;DR

This paper presents a method for precise optical frequency measurement using a Rb-stabilized ring-cavity resonator, demonstrating minimal dispersion errors and consistency with frequency-comb techniques.

Contribution

The authors develop a transfer cavity technique with a Rb-stabilized resonator and analyze wavelength-dependent dispersion errors, achieving high accuracy in optical frequency measurements.

Findings

No measurable dispersion errors within 30 kHz.

Frequency measurements are consistent with frequency-comb results.

The method achieves high accuracy comparable to advanced techniques.

Abstract

We have developed a technique to measure the absolute frequencies of optical transitions by using an evacuated Rb-stabilized ring-cavity resonator as a transfer cavity. We study possible wavelength-dependent errors due to dispersion at the cavity mirrors by measuring the frequency of the same transition in the $D_2$ line of Cs at three cavity lengths. We find no discernable change in values within our error of 30 kHz. Our values are consistent with measurements using the frequency-comb technique and have similar accuracy.