Low noise phase-locked laser system for atom interferometry

TL;DR

This paper presents a low noise, phase-locked fiber laser system for atom interferometry, achieving high stability and sensitivity suitable for field applications in gravimetry.

Contribution

The work introduces a fiber laser system with enhanced phase locking and linewidth performance, enabling long-term stable operation and high-precision measurements in atom interferometry.

Findings

Contributed 2.2 mrad shot-to-shot noise to the interferometer.

Achieved over 115 hours of continuous operation without relocking.

Reaching a sensitivity of 29 uGal/√Hz and resolution of 1.1 uGal in field tests.

Abstract

A low noise laser system for atom interferometry is realized with phase-locked fiber lasers, where the performance of the OPLL is greatly enhanced by the FEOM feedback loop and the narrow linewidths. The laser system demonstrated contribute 2.2 mrad per shot to the interferometer noise and permit continuous long-term operation for more than 115 hours without relocking in the field test. Also, the mobile gravimeter equipped with this phase-locked laser system reaches a sensitivity as good as 29 uGal/\sqrt{Hz} and a resolution of 1.1 uGal within 1500 s, demonstrating performances comparable to the state of the art.