Tailoring single-cycle electromagnetic pulses in the 2-9 THz frequency range using DAST/SiO2 multilayer structures pumped at Ti:sapphire wavelength

摘要

We present a numerical parametric study of single-cycle electromagnetic pulsegeneration in a DAST/SiO2 multilayer structure via collinear opticalrectification of 800 nm femtosecond laser pulses. It is shown thatmodifications of the thicknesses of the DAST and SiO2 layers allow tuning ofthe average frequency of the generated THz pulses in the frequency range from 3to 6 THz. The laser-to-THz energy conversion efficiency in the proposedstructures is compared with that in a bulk DAST crystal and aquasi-phase-matching periodically poled DAST crystal and shows significantenhancement.