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arXiv · 0805.3960

Development of signal-extraction scheme for Resonant Sideband Extraction

K. Kokeyama·K. Somiya·F. Kawazoe·S. Sato·S. Kawamura·A. Sugamoto
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Abstract

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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K. Kokeyama, K. Somiya, F. Kawazoe, S. Sato, S. Kawamura, A. Sugamoto. 2008-05-26. Development of signal-extraction scheme for Resonant Sideband Extraction. https://doi.org/10.1088/0264-9381%2F25%2F23%2F235013

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