Phys. Rev. Lett. 57, 2516–2519 (1986)Direct Observation of the Second-Order Coherence of Parametrically Generated LightReceived 16 June 1986; published in the issue dated 17 November 1986 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. © 1986 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.57.2516
DOI:
10.1103/PhysRevLett.57.2516
PACS:
42.65.Ky, 42.50.Dv, 42.65.Ma
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