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

Sensitivity of intracavity filtering schemes for detecting gravitational waves