Velocity matching by pulse front tilting for large-area THz-pulse generation
Velocity matching by pulse front tilting for large-area THz-pulse generation
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DOI：
10.1364/oe.10.001161
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发表时间：
2002-10-21
期刊：
影响因子：
3.8
通讯作者：
Kuhl, J
中科院分区：
文献类型：
--
作者：
Hebling, J;Almási, G;Kuhl, J
我们提出了一种普遍适用的速度匹配方法产生太赫兹脉冲的范围内低于非线性材料的声子频率的光整流。速度匹配是基于超短激发脉冲的脉冲前倾斜，并能够产生大面积的太赫兹光束。调谐的太赫兹辐射通过改变倾斜角的实验证明了一个窄线的范围内的0.8-0.97倍的声子频率。根据模型计算，宽带THz辐射可以在较低频率下产生。讨论了这种新的速度匹配技术相对于电光切伦科夫效应和非共线光束混频的优势。(C)2002年美国光学学会。
We propose a generally applicable velocity matching method for THz-pulse generation by optical rectification in the range below the phonon frequency of the nonlinear material. Velocity matching is based on pulse front tilting of the ultrashort excitation pulse and is able to produce a large-area THz beam. Tuning of the THz radiation by changing the tilt angle is experimentally demonstrated for a narrow line in the range between 0.8-0.97 times the phonon frequency. According to model calculations broad-band THz radiation can be generated at lower frequencies. Advantages of the new velocity matching technique in comparison to the electro-optic Cherenkov effect and non-collinear beam mixing are discussed. (C) 2002 Optical Society of America.