Appl Opt. 2020 Oct 10;59(29):9169-9173. doi: 10.1364/AO.402997.
We report the demonstration of imaging of a single human hair with a terahertz quantum cascade laser (THz-QCL) source based on intracavity difference-frequency generation. A single human hair whose diameter was about 100 µm was detected using the THz-QCL source operating at 240 K, of which the THz beam had a linear polarization. The results show that the THz image of a human hair clearly depends on the polarization direction of the THz beam. The THz QCL sources that are capable of room temperature operation will be useful for detection of small foreign objects like human hairs.
我们报告了基于腔内差频产生的太赫兹量子级联激光器 (THz-QCL) 源对单个人发进行成像的演示。使用工作温度为 240 K 的 THz-QCL 源检测直径约为 100 µm 的单个人发，其中太赫兹光束具有线性偏振。结果表明，人发的太赫兹图像明显取决于太赫兹光束的偏振方向。能够在室温下工作的 THz-QCL 源将有助于检测像人发这样的小异物。
