Sensitivity of intracavity filtering schemes for detecting gravitational waves

Mengyao Wang*, Haixing Miao, Andreas Freise, Yanbei Chen

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


We consider enhancing the sensitivity of future gravitational-wave detectors by adding optical filters inside the signal-recycling cavity - an intracavity filtering scheme, which coherently feeds the sideband signal back to the interferometer with a proper frequency-dependent phase. We study three cases of such a scheme with different motivations: (i) the case of backaction noise evasion, trying to cancel radiation-pressure noise with only one filter cavity for a signal-recycled interferometer; (ii) the speed-meter case, similar to the speed-meter scheme proposed by Purdue and Chen [Phys. Rev. D 66, 122004 (2002)] but without the resonant-sideband-extraction mirror, and also relieves the optical requirement on the sloshing mirror; (iii) the broadband detection case with squeezed-light input, numerically optimized for a broadband sensitivity.

Original languageEnglish
Article number062009
JournalPhysical Review D. Particles, Fields, Gravitation and Cosmology
Issue number6
Publication statusPublished - 31 Mar 2014
Externally publishedYes


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