Narrowing the Filter-Cavity Bandwidth in Gravitational-Wave Detectors via Optomechanical Interaction
We propose using optomechanical interaction to narrow the bandwidth of filter cavities for achieving frequency-dependent squeezing in advanced gravitational-wave detectors, inspired by the idea of optomechanically induced transparency. This can allow us to achieve a cavity bandwidth on the order of 100 Hz using small-scale cavities. Additionally, in contrast to a passive Fabry-Pérot cavity, the resulting cavity bandwidth can be dynamically tuned, which is useful for adaptively optimizing the detector sensitivity when switching amongst different operational modes. The experimental challenge for its implementation is a stringent requirement for very low thermal noise of the mechanical oscillator, which would need a superb mechanical quality factor and a very low temperature. We consider one possible setup to relieve this requirement by using optical dilution to enhance the mechanical quality factor.
© 2014 American Physical Society. Published 10 October 2014; received 2 September 2013. We thank Huan Yang, David McCelland, Farid Khalili, Li Ju, and Jiayi Qin for fruitful discussions. Y.M., S. L. D., C. Z., R. L.W., and D. G. B. have been supported by the Western Australia Centers of Excellence program, and by the Australian Research Council; W. Z. K. is supported by NSF Grant No. PHY-0757058; H. M. and Y. C. are supported by NSF Grant No. PHY-1068881 and NSF CAREER Grant No. PHY-0956189.
Published - PhysRevLett.113.151102.pdf
Submitted - 1402.4897v2.pdf
Supplemental Material - app0.pdf
Supplemental Material - app2.pdf
Supplemental Material - appendix2.pdf
Supplemental Material - appendix2.tex
Supplemental Material - supplementary_pdf.pdf
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