基于太赫兹量子级联激光器的反射式快速扫描成像

Fast Reflective Scanning Imaging Based on Terahertz Quantum-Cascade Laser

以太赫兹(THz)量子级联激光器为光源、低温热辐射计为信号接收端,采用可旋转和平移的二维扫描平台搭建反射式快速扫描成像系统。通过计算机控制扫描平台进行连续的旋转与平移运动,实时获取探测信号强度和样品位置信息,成功实现对直径为80mm圆形区域的快速扫描成像,扫描时间为5s,图像的平均空间分辨率约为1mm,系统成像时间大幅缩短。此外,成像装置中基于THz分束片的共光路设计,可有效减少系统光路元件,进一步缩小成像系统的体积。

A fast reflective scanning imaging system is constructed by employing the terahertz（THz）quantum-cascade laser as the light source and the low-temperature bolometer as the signal receiver.A rotational and translational platform is used in this imaging system to realize fast scanning.The fast imaging process of a circle area with a diameter of 80 mm is demonstrated by a computer controlling the scanning platform to carry out the rotational and translational motion.The signal intensity and the related 2D sample position are acquired simultaneously.By the imaging system,the scanning time is 5 s and the spatial resolution of the obtained image is 1 mm,which greatly shortens the imaging time.Furthermore,the optical components are reduced effectively by the co-optical path design based on THz beam splitters,which reduces the size of the THz imaging system.