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 TH...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.展开更多
基金supported by the National Natural Science Foundation of China(Nos.61201101,61601183 and 61205003)the Natural Science Foundation of Henan Province(No.162300410190)+2 种基金the Program for Innovative Talents(in Science and Technology)in University of Henan Province(No.18HASTIT023)the Young Backbone Teachers in University of Henan Province(No.2014GGJS-065)the Program for Innovative Research Team(in Science and Technology)in University of Henan Province(No.16IRTSTHN017)
文摘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.
