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 C/GaAs/C waveguiding heterostructure--is analyzed, a corresponding conversion rate is found, and ways for its further improvement are considered.
© 2006 Optical Society of America
Original Manuscript: April 24, 2006
Revised Manuscript: September 1, 2006
Manuscript Accepted: September 8, 2006
Vladimir A. Kukushkin, "Efficient generation of terahertz pulses from single infrared beams in C/GaAs/C waveguiding heterostructures," J. Opt. Soc. Am. B 23, 2528-2534 (2006)