Pushing cavities to the edge for future gravitational wave detectors

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

doi:10.1117/12.2505394

Pushing cavities to the edge for future gravitational wave detectors

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

Research output: Chapter in Book / Report / Conference proceeding › Conference contribution › 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 spot can reduce the thermal noise floor of the interferometer. These cavities operate close to the edge of geometrical stability, and may be driven into instability via small cavity length perturbations or mirror surface distortions. They are at risk of suffering from problems such as high optical scattering loss and Gaussian mode degeneracy. The well-defined Gaussian beams can also be distorted through their interaction with the small imperfections of the mirror surfaces. These issues have an adverse impact on the detector sensitivity and controllability. In this article an experiment is designed and has been built to investigate the technical hurdles associated with marginally cavities. A near-unstable table-top cavity is built and accurate control achieved through length and alignment control systems. This experiment provides an account of the behavior of the near-unstable cavity. Additionally, the experiment provides an insight into how far cavity parameters can be pushed towards geometrical instability.

Original language	English
Title of host publication	Optical Precision Manufacturing, Testing, and Applications
Editors	John W. McBride, Xuejun Zhang, Sen Han, JiuBin Tan
Publisher	SPIE
ISBN (Electronic)	9781510623361
DOIs	https://doi.org/10.1117/12.2505394
Publication status	Published - 1 Jan 2018
Externally published	Yes
Event	International Symposium on Optoelectronic Technology and Application 2018: Optical Precision Manufacturing, Testing, and Applications, OTA 2018 - Beijing, China Duration: 22 May 2018 → 24 May 2018

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	10847
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	International Symposium on Optoelectronic Technology and Application 2018: Optical Precision Manufacturing, Testing, and Applications, OTA 2018
Country/Territory	China
City	Beijing
Period	22/05/18 → 24/05/18

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).

Keywords

gravitational wave detection
laser interferometer
optical cavity
stable resonator

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10.1117/12.2505394

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Wang, H., Dovale-Alvarez, M., Collins, C., Brown, D. D., Wang, M., Mow-Lowry, C. M., Han, S., & Freise, A. (2018). Pushing cavities to the edge for future gravitational wave detectors. In J. W. McBride, X. Zhang, S. Han, & J. Tan (Eds.), Optical Precision Manufacturing, Testing, and Applications Article 108470N (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10847). SPIE. https://doi.org/10.1117/12.2505394

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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 spot can reduce the thermal noise floor of the interferometer. These cavities operate close to the edge of geometrical stability, and may be driven into instability via small cavity length perturbations or mirror surface distortions. They are at risk of suffering from problems such as high optical scattering loss and Gaussian mode degeneracy. The well-defined Gaussian beams can also be distorted through their interaction with the small imperfections of the mirror surfaces. These issues have an adverse impact on the detector sensitivity and controllability. In this article an experiment is designed and has been built to investigate the technical hurdles associated with marginally cavities. A near-unstable table-top cavity is built and accurate control achieved through length and alignment control systems. This experiment provides an account of the behavior of the near-unstable cavity. Additionally, the experiment provides an insight into how far cavity parameters can be pushed towards geometrical instability.",

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Wang, H, Dovale-Alvarez, M, Collins, C, Brown, DD, Wang, M, Mow-Lowry, CM, Han, S & Freise, A 2018, Pushing cavities to the edge for future gravitational wave detectors. in JW McBride, X Zhang, S Han & J Tan (eds), Optical Precision Manufacturing, Testing, and Applications., 108470N, Proceedings of SPIE - The International Society for Optical Engineering, vol. 10847, SPIE, International Symposium on Optoelectronic Technology and Application 2018: Optical Precision Manufacturing, Testing, and Applications, OTA 2018, Beijing, China, 22/05/18. https://doi.org/10.1117/12.2505394

Pushing cavities to the edge for future gravitational wave detectors. / Wang, Haoyu; Dovale-Alvarez, Miguel; Collins, Christopher et al.
Optical Precision Manufacturing, Testing, and Applications. ed. / John W. McBride; Xuejun Zhang; Sen Han; JiuBin Tan. SPIE, 2018. 108470N (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10847).

Research output: Chapter in Book / Report / Conference proceeding › Conference contribution › Academic › peer-review

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AU - Han, Sen

AU - Freise, Andreas

PY - 2018/1/1

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N2 - Near-unstable cavities have been proposed as an enabling technology for future gravitational wave detectors, as their compact structure and large beam spot can reduce the thermal noise floor of the interferometer. These cavities operate close to the edge of geometrical stability, and may be driven into instability via small cavity length perturbations or mirror surface distortions. They are at risk of suffering from problems such as high optical scattering loss and Gaussian mode degeneracy. The well-defined Gaussian beams can also be distorted through their interaction with the small imperfections of the mirror surfaces. These issues have an adverse impact on the detector sensitivity and controllability. In this article an experiment is designed and has been built to investigate the technical hurdles associated with marginally cavities. A near-unstable table-top cavity is built and accurate control achieved through length and alignment control systems. This experiment provides an account of the behavior of the near-unstable cavity. Additionally, the experiment provides an insight into how far cavity parameters can be pushed towards geometrical instability.

AB - Near-unstable cavities have been proposed as an enabling technology for future gravitational wave detectors, as their compact structure and large beam spot can reduce the thermal noise floor of the interferometer. These cavities operate close to the edge of geometrical stability, and may be driven into instability via small cavity length perturbations or mirror surface distortions. They are at risk of suffering from problems such as high optical scattering loss and Gaussian mode degeneracy. The well-defined Gaussian beams can also be distorted through their interaction with the small imperfections of the mirror surfaces. These issues have an adverse impact on the detector sensitivity and controllability. In this article an experiment is designed and has been built to investigate the technical hurdles associated with marginally cavities. A near-unstable table-top cavity is built and accurate control achieved through length and alignment control systems. This experiment provides an account of the behavior of the near-unstable cavity. Additionally, the experiment provides an insight into how far cavity parameters can be pushed towards geometrical instability.

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ER -

Wang H, Dovale-Alvarez M, Collins C, Brown DD, Wang M, Mow-Lowry CM et al. Pushing cavities to the edge for future gravitational wave detectors. In McBride JW, Zhang X, Han S, Tan J, editors, Optical Precision Manufacturing, Testing, and Applications. SPIE. 2018. 108470N. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2505394

Pushing cavities to the edge for future gravitational wave detectors

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Keywords

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