Feasibility of near-unstable cavities for future gravitational wave detectors

Haoyu Wang; Miguel Dovale-Álvarez; Christopher Collins; Daniel David Brown; Mengyao Wang; Conor M. Mow-Lowry; Sen Han; Andreas Freise

doi:10.1103/PhysRevD.97.022001

Feasibility of near-unstable cavities for future gravitational wave detectors

Haoyu Wang, Miguel Dovale-Álvarez, Christopher Collins, Daniel David Brown, Mengyao Wang, Conor M. Mow-Lowry, Sen Han, Andreas Freise

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

Near-unstable cavities have been proposed as an enabling technology for future gravitational wave detectors, as their compact structure and large beam spots can reduce the coating thermal noise of the interferometer. We present a tabletop experiment investigating the behavior of an optical cavity as it is parametrically pushed to geometrical instability. We report on the observed degeneracies of the cavity's eigenmodes as the cavity becomes unstable and the resonance conditions become hyper-sensitive to mirror surface imperfections. A simple model of the cavity and precise measurements of the resonant frequencies allow us to characterize the stability of the cavity and give an estimate of the mirror astigmatism. The significance of these results for gravitational wave detectors is discussed, and avenues for further research are suggested.

Original language	English
Article number	022001
Journal	Physical Review D
Volume	97
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevD.97.022001
Publication status	Published - 12 Jan 2018
Externally published	Yes

Funding

The authors would like to thank the Birmingham group including Haixing Miao, Anna Green, Daniel Töyrä, Sam Cooper, and Aaron Jones for useful comments and suggestions for this project. The authors would also like to thank technical engineers David Hoyland and John Bryant who helped build electronics and software. H. Wang and A. Freise have been supported by the Science and Technology Facilities Council (STFC). M Dovale Álvarez and D. D. Brown acknowledge financial support from the Defence Science and Technology Laboratory (DSTL) and the UK National Quantum Technology Hub in Sensors and Metrology with EPSRC Grant No. EP/M013294/1. D. D. Brown acknowledges support from the European Commission Horizon 2020 program under the Q-Sense project Grant No. 691156 (Q-Sense-H2020-MSCA-RISE-2015).

Funders	Funder number
European Commission Horizon 2020 program	Q-Sense-H2020-MSCA-RISE-2015
National Quantum Technology Hub
Defence Science and Technology Laboratory
Horizon 2020 Framework Programme	691156
Engineering and Physical Sciences Research Council	EP/M013294/1
Science and Technology Facilities Council	ST/N000633/1

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abstract = "Near-unstable cavities have been proposed as an enabling technology for future gravitational wave detectors, as their compact structure and large beam spots can reduce the coating thermal noise of the interferometer. We present a tabletop experiment investigating the behavior of an optical cavity as it is parametrically pushed to geometrical instability. We report on the observed degeneracies of the cavity's eigenmodes as the cavity becomes unstable and the resonance conditions become hyper-sensitive to mirror surface imperfections. A simple model of the cavity and precise measurements of the resonant frequencies allow us to characterize the stability of the cavity and give an estimate of the mirror astigmatism. The significance of these results for gravitational wave detectors is discussed, and avenues for further research are suggested.",

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AU - Wang, Haoyu

AU - Dovale-Álvarez, Miguel

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AU - Brown, Daniel David

AU - Wang, Mengyao

AU - Mow-Lowry, Conor M.

AU - Han, Sen

AU - Freise, Andreas

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Feasibility of near-unstable cavities for future gravitational wave detectors

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