发表机构
Ruhr-University Bochum; Indian Institute of Technology Indore; Helmholtz-Zentrum Dresden-Rossendorf; University Alliance Ruhr（波鸿鲁尔大学; 印度理工学院印多尔分校; 德累斯顿罗森多夫亥姆霍兹中心; 鲁尔大学联盟）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文展示了一种高平均功率太赫兹源驱动的高光谱相机，实现宽视场、高速并行电光检测，以2 Hz速率在14.5 mm视场上记录145,000像素的完整波形，为高速宽带成像开辟了新应用。
AI 中文摘要
太赫兹（THz）区域对于成像极具吸引力，因为它能穿透许多光学不透明材料，并能根据成分对其进行区分。在众多使我们能够进入这一光谱区域的方法中，太赫兹时域光谱（THz-TDS）特别适合获取宽带信息，它记录太赫兹电场的完整波形，以高灵敏度恢复振幅和相位。然而，将这一能力转化为快速、宽视场成像一直是一个重大挑战，这主要是因为传统TDS源的平均功率较低，迫使在采集速度、视场和灵敏度之间进行权衡。在此，我们展示了一种高光谱太赫兹相机，其中高平均功率、脉冲宽带太赫兹源在400 kHz重复频率下提供38.3 mW的功率，驱动宽视场上的并行电光检测，并以高采集速率运行。该系统在约14.5 mm的视场上，以2 Hz的采集速率，同时记录145,000个像素上的完整太赫兹波形（振幅和相位）。这些结果展示了高平均功率THz-TDS在宽带、高速成像方面的潜力，开启了诸如在线材料分辨检测以及对不可逆、秒级时间尺度过程（如生物相关系统中的水合作用）的光谱成像等应用。
英文摘要
The terahertz (THz) region is highly attractive for imaging because it penetrates many optically opaque materials and can distinguish them by composition. Among the various methods that allow us to access this spectral region, THz time-domain spectroscopy (THz-TDS) is uniquely suited to retrieve broadband information, recording the full waveform of the THz electric field to recover both amplitude and phase with high sensitivity. Translating this capability into fast, wide-field imaging has however remained a major challenge, largely because the low average power of conventional TDS sources forces a trade-off between acquisition speed, field of view, and sensitivity. Here we demonstrate a hyperspectral THz camera in which a high-average-power, pulsed broadband THz source, delivering 38.3 mW at a 400 kHz repetition rate, drives parallel electro-optic detection over a wide field of view at high acquisition rates. The system simultaneously records the full THz waveform, in amplitude and phase, across 145,000 pixels over a ~14.5 mm field of view at an acquisition rate of 2 Hz. These results demonstrate the potential of high-average-power THz-TDS for broadband, high-speed imaging, opening applications such as inline material-resolved inspection and the spectroscopic imaging of irreversible, second-timescale processes such as hydration in biologically relevant systems.
