Efficient Generation 1.5THz Pulses Using DASC/GaAs and DASB/GaAs Multilayer Structures via Difference Frequency Generation 1.5 µm Femtosecond Laser Pulses

We present a study of high efficient terahertz (THz) wave generation in DASB/GaAs, DASC/GaAs, and DAST/GaAs multilayer structures at 1.5THz via difference frequency generation (DFG) process with 1.5µm femtosecond laser pulses. We also compare the conversion efficiency in proposed structures with DASB/SiO2, DASC/SiO2, and DAST/SiO2 multilayer structures and bulk crystals DASB, DASC, and DAST. These structures compensate for phase mismatching in bulk crystals DASB, DASC, and DAST and increase conversion efficiency from 10^-5 in bulk organic crystals up to 10^-3 in multilayer structures. We show that DASC/GaAs is the best structure to generate 1.5THz waves.