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Path length modulation technique for scatter noise immunity in squeezing measurements

Andrew R. Wade, Sheon S. Y. Chua, Michael S. Stefszky, Daniel A. Shaddock, and David E. McClelland

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Abstract

We present a technique for frequency shifting scattering induced noise on squeezed light beams, providing immunity from scattered light while preserving the squeezed states. Using a 500 Hz pre and postsqueezing apparatus path length modulation, we show up to a 20 dB reduction in scattering induced noise while recovering squeezing measurement below the shot noise level. Such a technique offers immunity to spurious scattering sources without the need for optically lossy isolation optics.

© 2013 Optical Society of America

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