Audio-band coating thermal noise measurement for Advanced LIGO with a multimode optical resonator
Author(s)
Gras, Slawomir; Yu, H.; Yam, William; Martynov, Denis; Evans, Matthew J
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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.
Date issued
2017-01Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space ResearchJournal
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
ISSN
1550-7998
1550-2368