Laser intensity noise suppression for space-borne gravitational wave mission

TL;DR

This paper presents a novel feedback loop design to suppress laser intensity noise in space-borne gravitational wave detection, achieving ultra-low noise levels in a fiber amplifier system for precise measurements.

Contribution

It introduces a noise decomposition model and a specially designed optoelectronic feedback loop to significantly reduce laser intensity noise in the 0.1 mHz-1 Hz band.

Findings

Achieved ultra-low intensity noise in fiber amplifier system

Demonstrated effective noise suppression in the 0.1 mHz-1 Hz band

Provided experimental basis for ultra-low frequency measurement systems

Abstract

Laser intensity noise is a main limitation of measurement and sensing mission represented by gravitational wave detection. We develop a noise decomposition model and design the core elements of the feedback loop independently based on the analysis results. We construct a fiber amplifier system with ultra-low intensity noise in the 0.1 mHz-1 Hz frequency band by the employment of an optoelectronic feedback loop that is specially designed. The study provides experimental basis and technologies for precise measurement and sensing system at ultra-low frequency.