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 ) than in the initial pump pulse (center wavelength of , duration of , and pulse energy of ), with negligible pulse spatial and temporal distortion.
© 2006 Optical Society of America
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