金刚石中太赫兹波的对向传播混频
Counter-propagating frequency mixing with Terahertz waves in diamond
摘要：
利用克尔非线性效应实现的频率转换是紫外、可见、红外和中红外波段最常见和最具开发价值的非线性光学过程之一。在这里，我们表明可以在钻石中实现光场和太赫兹波的波混合，从而通过和频或差频产生实现太赫兹辐射的频率转换。在后一种情况下，我们表明，这个过程是相位匹配的，最有效的反传播的几何形状。
英文摘要：
Frequency conversion by means of Kerr-nonlinearity is one of the most common and exploited nonlinear optical processes in the UV, visible, IR and Mid-IR spectral regions. Here we show that wave mixing of an optical field and a Terahertz wave can be achieved in diamond, resulting in the frequency conversion of the THz radiation either by sum- or difference-frequency generation. In the latter case, we show that this process is phase-matched and most efficient in a counter-propagating geometry.
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