Monday, March 25, 2013

1303.5236 (Mengyao Wang et al.)

A realistic polarizing Sagnac topology with DC readout for the Einstein Telescope    [PDF]

Mengyao Wang, Charlotte Bond, Daniel Brown, Frank Brueckner, Ludovico Carbone, Rebecca Palmer, Andreas Freise
The Einstein Telescope (ET) is a proposed future gravitational wave detector. Its design is original, using a triangular orientation of three detectors and a xylophone configuration, splitting each detector into one high-frequency and one low-frequency system. In other aspects the current design retains the dual-recycled Michelson interferometer typical of current detectors, such as Advanced LIGO. In this paper, we investigate the feasibility of replacing the low-frequency part of the ET detectors with a Sagnac interferometer. We show that a Sagnac interferometer, using realistic optical parameters based on the ET design, could provide a similar level of radiation pressure noise suppression without the need for a signal recycling mirror and the extensive filter cavities. We consider the practical issues of a realistic, power-recycled Sagnac, using linear arm cavities and polarizing optics. In particular we investigate the effects of non-perfect polarizing optics and propose a new method for the generation of a local oscillator field similar to the DC readout scheme of current detectors.
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