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THz-wave parametric sources and imaging applications

机译：太赫兹波参数源和成像应用

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摘要

We have studied the generation of terahertz (THz) waves by optical parametric processes based on laser light scattering from the polariton mode of nonlinear crystals. Using parametric oscillation of MgO-doped LiNbO_3 crystal pumped by a nano-second Q-switched Nd:YAG laser, we have realized a widely tunable coherent THz-wave sources with a simple configuration. We have also developed a novel basic technology for THz imaging, which allows detection and identification of chemicals by introducing the component spatial pattern analysis. The spatial distributions of the chemicals were obtained from terahertz multispectral transillumination images, using absorption spectra previously measured with a widely tunable THz-wave parametric oscillator. Further we have applied this technique to the detection and identification of illicit drugs concealed in envelopes. The samples we used were methamphetamine and MDMA, two of the most widely consumed illegal drugs in Japan, and aspirin as a reference.
机译：我们已经研究了基于非线性晶体极化模式的激光散射通过光参量过程产生的太赫兹（THz）波的过程。利用由纳秒级Q开关Nd：YAG激光器泵浦的掺MgO的LiNbO_3晶体的参数振荡，我们已经实现了具有简单配置的可广泛调谐的相干THz波源。我们还为THz成像开发了一种新颖的基本技术，该技术可通过引入组件空间模式分析来检测和识别化学物质。化学药品的空间分布是从太赫兹多光谱透射照明图像中获得的，使用先前使用可广泛调谐的THz波参量振荡器测量的吸收光谱。此外，我们已将此技术应用于隐藏在信封中的非法药物的检测和识别。我们使用的样品是甲基苯丙胺和摇头丸，这是日本使用最广泛的两种非法药物，并使用阿司匹林作为参考。

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