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ABRAM, I; RAJ, R. K; OUDAR, J. L; DOLIQUE, G
Physical review letters, 11/1986, Letnik: 57, Številka: 20Journal Article
The second-harmonic spectrum of the output of an optical parametric emitter at degeneracy exhibits a narrow peak, much sharper than the spectrum of the parametric light. This peak is a manifestation of the second-order correlations in parametric light. Alternatively, it can be considered as resulting from the recombination of simultaneously generated (twin) wave packets. The twin-wave-packet correlation time is shown to be limited by the first order coherence time of parametric light. (Author)
