Abstract

We investigate the upconversion process of broadband incoherent light generated by parametric downconversion. We focus on the incoherent component of the sum-frequency generated (SFG) radiation, analyzing its spatiotemporal properties. We show that its spectrum has a skewed geometry in space-time, originating from a compensation between the group-velocity mismatch and the spatial walk-off of the fundamental and the SFG fields. The results are illustrated by a theoretical modeling of the optical system and by experimental measurements.

© 2014 Optical Society of America

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