Raman scattering and terahertz-wave parametric generation with nonlinear optical crystal MgO:LiNbO3

Polariton dispersion and THz-wave generation in MgO:LiNbO
₃
single crystal have been investigated by using Raman scattering and THz parametric generation system. The polariton dispersion curve was obtained on the basis of A
₁
(z) mode of Raman scattering experiment. Wavelengths of the idler beam and the THz-wave were calculated using the phase matching condition with the dispersion curve. We have made a TPG system and directly measured the wavelength of the idler beam. The range of the phase matching angle in the TPG system was 0.35~0.80deg, and the frequency of the THz-wave corresponding to the pump and idler beam was measured to be in the range of 0.95~2.30 THz. They agreed well with those calculated by the polariton dispersion curve.