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Laser Feedback Interferometry as a Tool for Analysis of Granular Materials at Terahertz Frequencies: Towards Imaging and Identification of Plastic Explosives

机译:激光反馈干涉法作为太赫兹频率下颗粒材料分析的工具:对塑料炸药的成像和鉴定

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摘要

We propose a self-consistent method for the analysis of granular materials at terahertz (THz) frequencies using a quantum cascade laser. The method is designed for signals acquired from a laser feedback interferometer, and applied to non-contact reflection-mode sensing. Our technique is demonstrated using three plastic explosives, achieving good agreement with reference measurements obtained by THz time-domain spectroscopy in transmission geometry. The technique described in this study is readily scalable: replacing a single laser with a small laser array, with individual lasers operating at different frequencies will enable unambiguous identification of select materials. This paves the way towards non-contact, reflection-mode analysis and identification of granular materials at THz frequencies using quantum cascade lasers.
机译:我们提出了一种使用量子级联激光在太赫兹(THz)频率下分析颗粒材料的自洽方法。该方法专为从激光反馈干涉仪获取的信号而设计,并应用于非接触反射模式感测。我们的技术使用三种塑料炸药进行了演示,与通过THz时域光谱法获得的传输几何中的参考测量值达到了良好的一致性。这项研究中描述的技术易于扩展:用小型激光器阵列替换单个激光器,并以工作在不同频率的单个激光器可以明确识别所选材料。这为使用量子级联激光器以太赫兹频率进行非接触,反射模式分析和识别颗粒材料铺平了道路。

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