Analysis and visualization of the output mode-matching requirements for squeezing in Advanced LIGO and future gravitational wave detectors

Antonio Perreca, Aidan F. Brooks, Jonathan W. Richardson, Daniel Töyrä, and Rory Smith
Phys. Rev. D 101, 102005 – Published 26 May 2020

Abstract

The sensitivity of ground-based gravitational-wave (GW) detectors will be improved in the future via the injection of frequency-dependent squeezed vacuum. The achievable improvement is ultimately limited by losses of the interferometer electromagnetic field that carries the GW signal. The analysis and reduction of optical loss in the GW signal chain will be critical for optimal squeezed light-enhanced interferometry. In this work, we analyze a strategy for reducing output-side losses due to spatial mode mismatch between optical cavities with the use of adaptive optics. Our goal is not to design a detector from the top down, but rather to minimize losses within the current design. Accordingly, we consider actuation on optics already present and one transmissive optic to be added between the signal recycling mirror and the output mode cleaner. The results of our calculation show that adaptive mode-matching with the current Advanced LIGO design is a suitable strategy for loss reduction that provides less than 2% mean output mode-matching loss. The range of actuation required is +47μD on SR3, +140mD on OM1 and OM2, +50mD on the SRM substrate, and 50mD on the added new transmissive optic. These requirements are within the demonstrated ranges of real actuators in similar or identical configurations to the proposed implementation. We also present a novel technique that graphically illustrates the matching of interferometer modes and allows for a quantitative comparison of different combinations of actuators.

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  • Received 27 January 2020
  • Accepted 28 April 2020

DOI:https://doi.org/10.1103/PhysRevD.101.102005

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Antonio Perreca

  • University of Trento, Department of Physics, I-38123 Povo, Trento, Italy and INFN, Trento Institute for Fundamental Physics and Applications, I-38123 Povo, Trento, Italy

Aidan F. Brooks and Jonathan W. Richardson

  • LIGO Laboratory, California Institute of Technology, Pasadena, California 91125, USA

Daniel Töyrä

  • Department of Quantum Science and Centre for Gravitational Physics, Australian National University, Canberra ACT 2600, Australia

Rory Smith

  • OzGrav: The ARC Centre of Excellence for Gravitational-Wave Discovery, Monash University, Victoria 3800, Australia

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Issue

Vol. 101, Iss. 10 — 15 May 2020

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