Development of signal-extraction scheme for Resonant Sideband Extraction

Details Development of signal-extraction scheme for Resonant Sideband Extraction Development of signal-extraction scheme for Resonant Sideband Extraction

2008-05-26

arxiv.org/abs/0805.3960v1

Class.Quant.Grav.25:235013,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 6 figures, 2 tables

Scientific paper

10.1088/0264-9381/25/23/235013

As a future plan, an advanced gravitational-wave detector will employ an optical configuration of resonant sideband extraction (RSE), achieved with an additional mirror at the signal-detection port of the power-recycled Fabry-Perot Michelson interferometer. To control the complex coupled cavity system, one of the most important design issues is how to extract the longitudinal control signals of the cavities. We developed a new signal-extraction scheme which provides an appropriate sensing matrix. The new method uses two sets of sidebands: one of the sideband components satisfies the critical coupling ondition for the RSE interferometer and reaches the signal-extraction port, and the other sideband is completely reflected by the Michelson interferometer. They provide a diagonalized sensing matrix and enable the RSE control to be robust.

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