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

Perreca, Antonio and Brooks, Aidan F. and Richardson, Jonathan W. and Töyrä, Daniel and Smith, Rory (2020) Analysis and visualization of the output mode-matching requirements for squeezing in Advanced LIGO and future gravitational wave detectors. Physical Review D, 101 (10). Art. No. 102005. ISSN 2470-0010. doi:10.1103/physrevd.101.102005.

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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 + 47 μD on SR3, +140 mD on OM1 and OM2, +50 mD on the SRM substrate, and −50 mD 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.

Item Type:Article
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URLURL TypeDescription Paper
Brooks, Aidan F.0000-0003-4295-792X
Richardson, Jonathan W.0000-0002-1472-4806
Additional Information:© 2020 American Physical Society. Received 27 January 2020; accepted 28 April 2020; published 26 May 2020. We are grateful to Evan Hall for providing the O3 noise curves, John Miller for providing the squeezing loss code, and Hiro Yamamoto for helpful comments in the early stages of this project. We also thank Daniel Brown for helpful comments during LSC review. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under cooperative Agreement No. PHY-0757058. This paper has LIGO Document Number LIGO-P1900375.
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LIGO DocumentP1900375
Issue or Number:10
Record Number:CaltechAUTHORS:20200526-122921553
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103453
Deposited By: Tony Diaz
Deposited On:26 May 2020 19:35
Last Modified:16 Nov 2021 18:21

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