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设计了一种新型的表面辐射内腔太赫兹波参量振荡器,交叉谐振腔结构允许增益介质放置在泵浦光谐振腔内,使用浅表垂直辐射结构能够从铌酸锂晶体中有效耦合输出太赫兹波。推导了在太赫兹波参量振荡器中非共线相位匹配条件下有效参量增益长度的表达式。大的泵浦光尺寸和长的增益介质长度能增加有效参量增益长度。在有效参量增益长度表达式的基础上推导了太赫兹波参量振荡器的阈值表达式,在不同的参数条件下理论分析了谐振腔阈值表达式。大尺寸泵浦光、低频太赫兹波、短谐振腔腔长、斯托克斯光高反射率输出镜、长增益介质能有效降低太赫兹波参量振荡器阈值。文中的阈值分析对太赫兹参量振荡器的实验研究有参考价值。
A new type of surface-radiated cavity THz parametric oscillator is designed. The cross-resonator structure allows the gain medium to be placed in the pump cavity. Using the superficial vertical radiation structure, the output from the LiNbO3 crystal can be efficiently coupled Hertz wave. The expression of the effective parameter gain length under the condition of non-collinear phase matching in terahertz wave parametric oscillator is deduced. The large pump light size and long gain media length increase the effective parametric gain length. The threshold expression of terahertz wave parametric oscillator is deduced based on the expression of effective parameter gain length. The threshold expression of the resonator is theoretically analyzed under different parameters. Large-size pump light, low frequency terahertz wave, short cavity length, Stokes light high reflectivity output mirror, long gain medium can effectively reduce the terahertz wave parametric oscillator threshold. The threshold analysis in this paper has reference value for the experimental research of terahertz parametric oscillator.