Abstract

The difference-frequency terahertz (THz) pulse generation from Fourier components of a single infrared laser pulse in waveguiding heterostructures is considered. It is shown that a proper choice of the waveguide parameters allows for the significant reduction of the input pulse group-velocity dispersion (GVD). As a result, it is possible to noticeably increase the length of such devices and, consequently, the pump-THz pulse conversion efficiency by employing low absorbing materials with high intrinsic GVD coefficients for their fabrication. A particular example of such a scheme—a CGaAsC waveguiding heterostructure—is analyzed, a corresponding conversion rate is found, and ways for its further improvement are considered.

© 2006 Optical Society of America

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