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Stimulated polariton scattering(SPS) based on noncollinear phase matching scheme from the A_1-symmetry modes of KNbO_3 crystal is investigated for generating terahertz(THz) wave. Frequency tuning characteristics of THz wave by varying the phase matching angle and pump wavelength are analyzed. The expression of the effective parametric gain length under the noncollinear phase matching condition is deduced. Parametric gain and absorption characteristics of THz wave in KNbO_3 are theoretically simulated. The characteristics of KNbO_3 for parametric oscillator(TPO) are compared with those of Mg O:LiNbO_3. The analysis results indicate that KNbO_3 is an excellent optical crystal for TPO to enhance the output of THz wave.
Stimulated polariton scattering (SPS) based on noncollinear phase matching scheme from the A_1-symmetry modes of KNbO_3 crystal is investigated for generating terahertz (THz) wave. Frequency tuning characteristics of THz wave by varying the phase matching angle and pump wavelength are analyzed. Parametric gain and absorption characteristics of THz wave in KNbO_3 are theoretically simulated. The characteristics of KNbO_3 for parametric oscillator (TPO) are compared with those of MgO: LiNbO_3. The analysis results indicate that KNbO_3 is an excellent optical crystal for TPO to enhance the output of THz wave.