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Control and tuning of a suspended Fabry–Perot cavity using digitally enhanced heterodyne interferometry

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Abstract

We present the first demonstration of real-time closed-loop control and deterministic tuning of an independently suspended Fabry–Perot optical cavity using digitally enhanced heterodyne interferometry, realizing a peak sensitivity of 10pm/Hz over the 10–1000 Hz frequency band. The methods presented are readily extensible to multiple coupled cavities. As such, we anticipate that refinements of this technique may find application in future interferometric gravitational-wave detectors.

© 2012 Optical Society of America

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