Monochromatic and Tunable Terahertz Source Based on Nonlinear Optics

摘要

cqvip:Recent progresses made by authors on monochromatic and tunable terahertz(THz)generation based on nonlinear optics are reviewed,including THz parametric oscillation(TPO)and difference frequency generation(DFG).From the technical point of view,we develop extra-and intra-cavity surface-emitted TPO,as well as DFG with QPM-GaAs crystal.From the point of view of mechanism,Cherenkov phase-matching is comprehensively investigated in both bulk crystal and planar waveguide.A novel scheme for cascading enhanced Cherenkov DFG in waveguide is proposed.From the point of view of material,organic crystal4-N,N-dimethylamino-4’-N’-methyl-stibazolium tosylate(DAST)is utilized as the nonlinear medium.