Abstract

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 1080nm and degenerate wavelength of 1885nm, the source also emits a high flux of 3.4×1011s1W1 photon pairs constrained to a cone of only 2° 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.

© 2007 Optical Society of America

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