Lim Yah Leng, Bertling Karl, Taimre Thomas, Gillespie Tim, Glenn Chris, Robinson Ashley, Indjin Dragan, Han Yingjun, Li Lianhe, Linfield Edmund H, Davies A Giles, Dean Paul, Rakić Aleksandar D
Opt Express. 2019 Apr 1;27(7):10221-10233. doi: 10.1364/OE.27.010221.
We report a coherent terahertz (THz) imaging system that utilises a quantum cascade laser (QCL) operating in pulsed-mode as both the source and detector. The realisation of a short-pulsed THz QCL feedback interferometer permits both high peak powers and improved thermal efficiency, which enables the cryogen-free operation of the system. In this work, we demonstrated pulsed-mode swept-frequency laser feedback interferometry experimentally. Our interferometric detection scheme not only permits the simultaneous creation of both amplitude and phase images, but inherently suppresses unwanted background radiation. We demonstrate that the proposed system utilising microsecond pulses has the potential to achieve 0.25 mega-pixel per second acquisition rates, paving the pathway to video frame rate THz imaging.
我们报道了一种相干太赫兹（THz）成像系统，该系统利用工作在脉冲模式下的量子级联激光器（QCL）作为光源和探测器。短脉冲太赫兹QCL反馈干涉仪的实现既允许高峰值功率又提高了热效率，从而使系统能够在无低温冷却剂的情况下运行。在这项工作中，我们通过实验演示了脉冲模式扫频激光反馈干涉测量法。我们的干涉检测方案不仅允许同时创建幅度和相位图像，而且固有地抑制了不需要的背景辐射。我们证明，所提出的利用微秒脉冲的系统有可能实现每秒0.25兆像素的采集速率，为视频帧率太赫兹成像铺平了道路。
