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Nonlinear Guided Waves and Their Applications

Influence of walk-off, dispersion and diffraction on the coherence of parametric fluorescence in the (2+1)D geometry

Antonio Picozzi, Marc Haelterman

Published Jan 1, 2001• 0 citations
Publisher

Abstract

Considering the (2+1)D-problem of parametric fluorescence from a plane-wave pump, we show analytically and numerically that the walk-off between the down-converted fields leads to spatio-temporal coherence whereas the diffraction leads to an incoherent dynamics.
DOI
10.1364/nlgw.2001.wa6

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We investigate the emergence of spatial and temporal coherence for the fields in the noncritical nondegenerate parametric second-order down-conversion process pumped with low spatial and temporal coherence beams. It is shown that in this scenario, which is of considerable practical importance, the parametric gain in the near field breaks down into an ensemble of mutually incoherent beamlets containing parametric waves. The field generated in a single beamlet is fully spatially coherent. The size of such coherent parametric gain regions is governed by the near-field spatial coherence radius of the pump, which also acts as a parameter, restraining the linear diffraction of the parametric waves generated in the nonlinear interaction. Furthermore, we experimentally demonstrate how the spatial and temporal coherence can be substantially enhanced by manipulating the spatial field correlation of the multilongitudinal and multi-transversal mode pump.