Robust laser frequency stabilization by serrodyne modulation

TL;DR

This paper demonstrates a robust method for laser frequency stabilization using serrodyne modulation, achieving high correction bandwidth and low noise, outperforming traditional acousto-optical schemes, with promising applications in optical cavity stabilization.

Contribution

The study introduces serrodyne frequency shifting for laser stabilization, offering higher correction bandwidth and lower noise than standard methods.

Findings

Correction bandwidth of 2.3 MHz achieved.

Dynamic range of 220 MHz demonstrated.

Serrodyne modulation outperforms acousto-optical schemes.

Abstract

We report the relative frequency stabilization of a distributed feedback erbium-doped fiber laser on an optical cavity by serrodyne frequency shifting. A correction bandwidth of 2.3 MHz and a dynamic range of 220 MHz are achieved, which leads to a strong robustness against large disturbances up to high frequencies. We demonstrate that serrodyne frequency shifting reaches a higher correction bandwidth and lower relative frequency noise level compared to a standard acousto-optical modulator based scheme. Our results allow to consider promising applications in the absolute frequency stabilization of lasers on optical cavities.