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In anticipation of an upgrade of the LIGO detector to an advanced configuration in 2004, a tabletop prototype of resonant sideband extraction is being designed and constructed at Caltech. We present here two frontally modulated length sensing and control schemes, one in which the signal extraction/recycling mirror is a simple mirror, and one in which it is a Fabry-Perot cavity. Issues regarding the controllability, RF sideband transmission, shot noise, and noise couplings are discussed.

Signal extraction and length sensing for LIGO II RSE