Theoretical study of phase-matching properties for tunable terahertz-wave generation in isotropic nonlinear crystals

Abstract:

Theoretical investigation of the phase-matching properties for the tunable coherent terahertz wave generation in the isotropic semiconductor nonlinear materials of CdTe and GaP is presented according to their optical dispersion properties, based on a pulsed dual-wavelength KTP-OPO operating near degenerate point in the process of the difference frequency mixing.The cross-Reststrahlen band dispersion compensation phase-matching technique involved in this interaction is introduced concisely. The optimum lengths of DFG crystals are decided according to the minimum coherence lengths of the crystals in the given pump wavelength ranges. The results of analysis and calculation provide the useful and necessary theoretical basis and guidance for the future experiments.