Abstract

Nondegenerate optical parametric oscillators generate above-threshold signal and idler beams that have intensity fluctuations correlated at the quantum level (twin beams). We describe what is to our knowledge the first high-sensitivity spectroscopy experiment using twin beams emitted by a cw optical parametric oscillator: a very weak two-photon absorption signal, in the 10-7 range, is recorded on the 4S1/25S1/2 transition of atomic potassium with a noise background that is reduced by 1.9  dB with respect to the shot-noise limit of the light used in the experiment.

© 1997 Optical Society of America

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