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
Original Manuscript: April 19, 2013
Manuscript Accepted: May 19, 2013
Published: June 25, 2013
Andrew R. Wade, Sheon S. Y. Chua, Michael S. Stefszky, Daniel A. Shaddock, and David E. McClelland, "Path length modulation technique for scatter noise immunity in squeezing measurements," Opt. Lett. 38, 2265-2267 (2013)