3 dB squeezing by single-pass parametric amplification in a periodically poled KTiOPO4 crystal

Opt Lett. 2005 Jul 1;30(13):1722-4. doi: 10.1364/ol.30.001722.

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 Nd:YVO4 laser. With a single pass through a 10 mm long periodically poled KTiOPO4 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.