Abstract
We report the generation of pulsed twin beams of light from an optical parametric amplifier (OPA) that is pumped by the second harmonic of a mode-locked and Q-switched Nd:YAG laser. The intensity noises on the direct-detected signal and idler beams at the output of the are correlated by more than 15 dB and the subtracted noise falls below the quantum limit by more than 6 dB (75%). To our knowledge, this is the highest quantum noise reduction ever observed in any experiment to date.
© 1990 Optical Society of America
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