Phys. Rev. A 77, 053822 (2008) [10 pages]Hong-Ou-Mandel interferometer with one and two photon pairsReceived 9 October 2007; revised 26 February 2008; published 30 May 2008 We study the Hong-Ou-Mandel interferometer in the regime of spontaneous parametric down-conversion with high pump beam power at the crystal. In this regime one and two photons from a pump pulsed laser beam generate one and two pairs of photons, respectively. These photons are then directed to the beam splitter of the interferometer and detected at its exit in coincidence. An interesting phenomenon is observed: The reduction of the visibility of the Hong-Ou-Mandel coincidence peak (or dip) with the increase of pump power. We study the relation between the visibility of the fourth-order interference pattern and the power of the pumping laser beam for type I and type II phase-matching crystals. Our theoretical calculations are in good agreement with the experimental results. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.053822
DOI:
10.1103/PhysRevA.77.053822
PACS:
42.50.Dv, 42.65.−k, 42.25.Hz
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