Optical spring tracking for enhancing quantum-limited interferometers

Modern interferometers such as LIGO have achieved sensitivities limited by quantum noise, comprising 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...

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Bibliographic Details
Published in:Optics letters 2024-12, Vol.49 (24), p.6980
Main Authors: Aronson, Scott, Pagano, Ronald, Cullen, Torrey, Cole, Garrett D, Corbitt, Thomas
Format: Article
Language:English
Subjects:
Gravitational waves
Interferometers
Noise measurement
Noise sensitivity
Radiation pressure
Shot noise
Signal to noise ratio
Tracking
White noise
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Summary:Modern interferometers such as LIGO have achieved sensitivities limited by quantum noise, comprising 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 a proof-of-principle experiment of dynamically tracking a target signal using an optical spring, resulting in an increased signal-to-noise ratio (SNR). By injecting white noise to simulate excess shot noise, we found the SNR increased by up to a factor of 40 via dynamical tracking when compared to a static configuration.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.540195