Nakanishi Atsushi, Fujita Kazuue, Horita Kazuki, Takahashi Hironori
Opt Express. 2019 Feb 4;27(3):1884-1893. doi: 10.1364/OE.27.001884.
We demonstrate high-quality non-destructive imaging using a broadband terahertz quantum cascade laser source based on Cerenkov difference-frequency generation. The source exhibited ultra-broadband terahertz emission spectra, as well as a single-lobed Gaussian-like far-field pattern at -30 °C. These features allowed us to build a compact imaging system with a high spatial resolution, from which a nearly theoretical minimum beam spot size was obtained. As a result, we achieve well-resolved, high-contrast images of objects obscured by opaque materials. We also achieved terahertz imaging with the THz DFG-QCL operated at room temperature.
我们展示了基于切伦科夫差频产生的宽带太赫兹量子级联激光源的高质量无损成像。该源在-30°C时表现出超宽带太赫兹发射光谱以及单瓣类高斯远场模式。这些特性使我们能够构建一个具有高空间分辨率的紧凑型成像系统，从中获得了接近理论最小光斑尺寸。结果，我们获得了被不透明材料遮挡的物体的清晰分辨、高对比度图像。我们还实现了在室温下运行的太赫兹差频产生量子级联激光器的太赫兹成像。
