We have constructed a numerical model for injection-seeded terahertz-wave parametric generators in which the pump depletion, the duration of the pump pulse, as well as the spatial modes of the pump and seed beams are taken into consideration. Compared with other models which only provide the parametric gain under the assumption of low pump depletion, our model can make the predictions on the energy as well as spatial and temporal profiles of the generated terahertz-wave. Besides, the appropriate value of nonlinear coefficient of MgO:LiNbO₃ in terahertz regime is difficult to find in the published works. To solve this problem, Miller’s rule is applied for the wavelength scaling of the nonlinear coefficient during calculation. We present a detailed description of the model and show that its predictions agree well with the reported experimental results. The presented model allows the performance to be estimated when designing an injection-seeded terahertz-wave parametric generator.

中文翻译：

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注入种子的太赫兹波参数发生器的数值建模

我们为注入种子的太赫兹波参数发生器构建了一个数值模型，其中考虑了泵的损耗，泵脉冲的持续时间以及泵和种子束的空间模式。与仅在低泵损耗的假设下仅提供参数增益的其他模型相比，我们的模型可以对生成的太赫兹波的能量以及时空分布进行预测。另外，MgO：LiNbO ₃的非线性系数的适当值在太赫兹政权中很难在已发表的著作中找到。为了解决这个问题，在计算过程中将米勒法则用于非线性系数的波长缩放。我们目前对该模型进行详细说明，并表明其预测与所报道的实验结果吻合良好。提出的模型允许在设计注入种子的太赫兹波参数发生器时评估性能。