Audio-band coating thermal noise measurement for Advanced LIGO with a multimode optical resonator
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PhysRevD.95.022001.pdf
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Author(s)
Gras, Slawomir
Yu, H.
Yam, William
Martynov, Denis
Evans, Matthew J
Date Issued
January 2017
Journal
Physical Review D
Publisher
American Physical Society
Citation
Gras, S. et al. “Audio-Band Coating Thermal Noise Measurement for Advanced LIGO with a Multimode Optical Resonator.” Physical Review D 95.2 (2017): n. pag. © 2017 American Physical Society
Version
Final published version
Abstract
In modern high precision optical instruments, such as in gravitational wave detectors or frequency references, thermally induced fluctuations in the reflective coatings can be a limiting noise source. This noise, known as coating thermal noise, can be reduced by choosing materials with low mechanical loss. Examination of new materials becomes a necessity in order to further minimize the coating thermal noise and thus improve sensitivity of next generation instruments. We present a novel approach to directly measure coating thermal noise using a high finesse folded cavity in which multiple Hermite-Gaussian modes coresonate. This method is used to probe surface fluctuations on the order 10[superscript -17] m√Hz in the frequency range 30–400 Hz. We applied this technique to measure thermal noise and loss angle of the coating used in Advanced LIGO.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.95.022001
