Abstract

We obtain information about the amplitude fluctuations of both signal and idler beams from a doubly resonant optical parametric oscillator (DRO) without an optical isolator or a frequency stabilizer. To get a total noise power spectrum, we digitized the photocurrents of the cross-polarized twin beams from the DRO and calculated the noise spectra of the two beams from the digitized data; we also calculated the sum and the difference of the two beams. We fabricated a DRO with a KTiOPO₄ (KTP) crystal pumped by a single-mode Ar⁺ laser (514.5 nm). The experimental results of the quantum-mechanical correlations of the twin beams are well fitted by a theoretical prediction [ J. Opt. Soc. Am. B 4, 1520 ( 1987)].

© 1994 Optical Society of America

Stabilization and tuning of a doubly resonant optical parametric oscillator

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