Optical Spring Tracking for Enhancing Quantum-Limited Interferometers

TL;DR

This paper introduces a method using optical spring tracking to dynamically follow gravitational wave signals, significantly improving the signal-to-noise ratio in quantum-limited interferometers like LIGO.

Contribution

It presents a novel dynamic tracking technique with optical springs to enhance SNR for gravitational wave detection, surpassing static noise minimization methods.

Findings

Achieved up to 40-fold increase in SNR.

Demonstrated effective real-time signal tracking.

Enhanced sensitivity of quantum-limited interferometers.

Abstract

Modern interferometers such as LIGO have achieved sensitivities limited by quantum noise, comprised of radiation pressure and shot noise. To mitigate this noise, a static system is employed that minimizes the quantum noise within the measurement band. However, since gravitational wave inspiral signals are a single frequency changing over time, only noise at the chirp frequency needs to be minimized. Here we demonstrate dynamically tracking a target signal using an optical spring, resulting in an increased signal to noise ratio (SNR). We report on a SNR increase by up to a factor of 40 when compared to a static configuration.