School of Electronic and Electrical Engineering, University of Leeds, Leeds, LS2 9JT, UK.
Opt Lett. 2011 Jul 1;36(13):2587-9. doi: 10.1364/OL.36.002587.
We demonstrate terahertz (THz) frequency imaging using a single quantum cascade laser (QCL) device for both generation and sensing of THz radiation. Detection is achieved by utilizing the effect of self-mixing in the THz QCL, and, specifically, by monitoring perturbations to the voltage across the QCL, induced by light reflected from an external object back into the laser cavity. Self-mixing imaging offers high sensitivity, a potentially fast response, and a simple, compact optical design, and we show that it can be used to obtain high-resolution reflection images of exemplar structures.
我们展示了使用单个量子级联激光器 (QCL) 进行太赫兹 (THz) 频率成像，该激光器用于产生和感测 THz 辐射。通过利用太赫兹 QCL 中的自混合效应来实现检测，具体来说，通过监测来自外部物体反射回激光腔的光引起的 QCL 电压的变化来实现检测。自混合成像具有高灵敏度、潜在的快速响应以及简单、紧凑的光学设计，我们表明它可用于获得示例结构的高分辨率反射图像。
