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Parametric cascade downconverter for intense ultrafast mid-infrared generation beyond the Manley–Rowe limit

James M. Fraser and Cathie Ventalon

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Abstract

We propose a scheme to generate intense, ultrafast mid-infrared pulses with conversion efficiencies exceeding the upper bound for single-stage difference-frequency mixing as predicted by the Manley–Rowe relations. Finite-element fast Fourier transform simulations of the mixing process show that the parametric cascade downconverter generates 1.7 times more photons (at 10  μm) than in the initial pump pulse (center wavelength of 1.48  μm, duration of 130  fs, and pulse energy of 50  μJ), with negligible pulse spatial and temporal distortion.

© 2006 Optical Society of America

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