Abstract

We report traveling-wave quadrature squeezing at 1064 nm in a quasi-phase-matched LiNbO3 waveguide, avoiding the gain-induced diffraction encountered in bulk squeezing experiments. The 10-mm-long single-mode waveguide parametric amplifier exhibited a gain of 1.9, averaged over the 20-ps mode-locked pulses, with only 0.5 W of peak pump power at 532 nm. Independent waveguides were employed for the degenerate parametric amplifier squeezer and for the second-harmonic generator that produced the pump for the parametric amplifier. We measured phase-sensitive amplification versus pump power and found close agreement with theory. The observed 14% squeezing correlates closely with the predicted value, based on the measured phase-sensitive amplification and 40% overall detection efficiency. Impedance-matched electrically resonant detection was used to boost our squeezing measurement signals substantially above the background level.

© 1995 Optical Society of America

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