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Opt Lett. 2007 Apr 1;32(7):817-9.

Observation of ultrabroadband, beamlike parametric downconversion.

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División de Física Aplicada, Centro de Investigación Científica yde Educación Superior de Ensenada, Ensenada, Baja California, 22800 Mexico.


We report spontaneous parametric downconversion having an unusually wide spectral bandwidth. A collinear type 1 phase-matching configuration is employed with degeneracy near the zero group-velocity dispersion frequency. With a spectral width of 1080 nm and degenerate wavelength of 1885 nm, the source also emits a high flux of 3.4 x 10(11) s(-1)W(-1) photon pairs constrained to a cone of only approximately 2 degrees half-angle. A rigorous theoretical approach is developed that confirms the experimental observations. The source properties are consistent with an ultrashort photon-pair correlation time and, for a narrowband pump, extremely high-dimensional spectral entanglement.

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