Abstract

Cascading effects were analyzed for the THz wave generation by optical rectification in an electro-optic crystal using intense femtosecond optical pulses. Coupled equations describing the propagation of the optical and THz fields were solved numerically. Cascaded difference frequency generation within the pump pulse spectrum was observed to leads to red shift of the pump light spectrum and almost linear growth of THz amplitude as a function of propagation distance. Conversion efficiency of THz waves higher than the Manley-Rowe limit, which corresponds to 100% quantum yield, was obtained in the simulation using a ZnTe crystal.

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