3 dB squeezing by single-pass parametric amplification in a periodically poled ${\mathrm{KTiOPO}}_4$ crystal

Abstract

We present the experimental observation of pulsed squeezed light from a degenerate optical parametric amplifier pumped by a second harmonic of a continuous-wave mode-locked $\mathrm{Nd}:{\mathrm{YVO}}_4$ laser. With a single pass through a 10 mm long periodically poled ${\mathrm{KTiOPO}}_4$ crystal, the classical parametric gain of 11 is observed. The measured noise reduction in the quiet quadrature is 3.2 dB below the shot-noise level.

© 2005 Optical Society of America

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