In-situ probing and stabilizing the power ratio of electro-optic-modulated laser pairs based on VIPA etalon for quantum sensing

TL;DR

This paper introduces a high-speed, in-situ method using a VIPA etalon to monitor and stabilize the power ratio of laser pairs in quantum sensing, enhancing precision in atom interferometers.

Contribution

It presents a novel VIPA etalon-based technique for real-time probing and stabilization of laser power ratios in compact electro-optic systems for quantum sensing.

Findings

Achieved sub-microsecond resolution in laser power transformation monitoring.

Locked the power ratio with high bandwidth despite environmental disturbances.

Demonstrated an Allan deviation of 4.39×10⁻⁵ at 1000 s for stability.

Abstract

Monitoring and stabilizing the power ratio of laser pairs is significant to high-precision atom interferometers, especially as the compact electro-optic modulated all-fiber laser system prevails. In this Letter, we demonstrate a novel method to in-situ probe the relative power of laser pairs and to stabilize the power ratio of two Raman lasers using a high-dispersion virtually imaged phased array (VIPA) etalon. Sub-microsecond resolution on probing laser power transformation during atom interferometer sequence is achieved and the power ratio of two Raman lasers (PRTR) is tightly locked with high bandwidth despite of environmental disturbances, showing an Allan deviation of $4.39\times 10^{-5}$ at 1000 s averaging time. This method provides a novel way to stabilize the PRTR and diagnose the multi-frequency laser systems for atom interferometers and could find potential application in broad quantum sensing scenarios.