太赫兹域光学差频产生的通用图表
Universal charts for optical difference frequency generation in the terahertz domain
摘要：
我们提出了一个通用的和严格的方法来研究差频产生在太赫兹域，保持自由度的数量最小，通过定义一个合适的品质因数。所提出的方法依赖于适当的归一化图表，使预测的光学太赫兹转换效率的任何系统的基础上在二次非线性材料中的波传播。我们的方法的预测被发现是在良好的协议与最好的实验结果迄今为止报道，也使估计的d22非线性系数的高品质的GaSe。
英文摘要：
We present a universal and rigorous approach to study difference frequency generation in the terahertz domain, keeping the number of degrees of freedom to a minimum, through the definition of a suitable figure of merit. The proposed method relies on suitably normalized charts, that enable to predict the optical-to-terahertz conversion efficiency of any system based on wave propagation in quadratic nonlinear materials. The predictions of our approach are found to be in good agreement with the best experimental results reported to date, enabling also to estimate the d22 nonlinear coefficient of high quality GaSe.
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