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采用参量振荡方法实现太赫兹辐射(THz-wave Parametric Oscillator,TPO),因只需一个固定波长的泵浦源和一块非线性晶体,且具有非线性转换效率高、调谐简单而倍受瞩目。以LiNbO3晶体为例,采用Q调制的Nd:YAG激光器(1.064μm)为泵浦源,角度匹配的非共线相位匹配方式,设计了太赫兹参量振荡器,实现了当入射角α从8.2°变化到14°,相位匹配角θ相应地从16.2°变化到54.75°,太赫兹波与泵浦光之间的夹角β从8.84°~67.88°,闲频光从1.068μm变化到1.0796μm,太赫兹波从284~74μm(1~4THz)的连续太赫兹波振荡。
The THz-wave Parametric Oscillator (THP) is achieved by the parametric oscillating method. It only needs a fixed-wavelength pump source and a nonlinear crystal, and has the advantages of high non-linear conversion efficiency and simple tuning. Taking LiNbO3 as an example, a Q-modulated Nd: YAG laser (1.064μm) is used as pump source and angle matched non-collinear phase matching method. The terahertz parametric oscillator was designed and the effect of the incident angle α from 8.2 ° The phase angle θ is changed from 16.2 ° to 54.75 ° correspondingly, the angle β between the terahertz wave and the pump light is changed from 8.84 ° to 67.88 °, the idler light changes from 1.068 μm to 1.0796 μm, Terahertz wave from 284 ~ 74μm (1 ~ 4THz) continuous terahertz oscillation.