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Opt Lett. 2005 Jul 1;30(13):1722-4.

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

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  • 1Department of Physics, Gokushuin University, Toshima-ku, Tokyo 171-8588, Japan. Takuya.Hirano@gakushuin.ac.jp


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.

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