利用红外微bolometric相机非标使用来分析THz光束
Profiling THz Beams With Off-Label Use of Infrared Microbolometric Cameras
AI总结：
本文展示通过非标使用红外相机实现与专用微bolometric THz相机相似的性能，成本仅为后者1%。实验比较了两种THz光束的分布，证明其在THz范围内的适用性，为高精度诊断提供新工具。
摘要：
可视化光束的空间分布对于评估辐照度、表征光束质量以及实现精确对准至关重要。在光学波段，这通常使用基于硅的CCD和CMOS相机实现。然而，在太赫兹（THz）范围内，这通常需要专用的检测器，其成本过高。本文展示，通过将红外（IR）相机用于非标用途，可以实现与专用微bolometric THz相机相似的性能，且成本仅为后者1%。我们通过表征两种THz光束的分布来比较相机：一种是通过有机晶体的光学 rectification 产生的脉冲宽带THz光束，另一种是通过量子级联激光器发射的窄带准连续波（准-CW）THz光束。对于宽带THz辐射，两种相机测量的光束宽度差异仅约为6%，在像素分辨率限制内；而在窄带准-CW情况下，差异仅为约1.3%。此外，红外相机的最小可检测功率（低至1.5 THz）低于THz相机，同时保持线性和偏振无关的响应性。这些结果扩展了传统红外相机在THz范围内的应用，表明它们将成为科学和工业应用中高保真THz光束诊断和成像的常规工具。
英文摘要：
Visualizing the spatial profile of light beams is essential for evaluating irradiance, characterizing beam quality, and achieving precise alignment. In the optical spectral range, this is readily performed using silicon-based CCD and CMOS cameras. In the terahertz (THz) range, however, it typically requires specialized detectors with prohibitive costs. Here, we show that an infrared (IR) camera can be used outside of its labeled specifications to achieve similar performance as a dedicated microbolometric THz camera, at under 1% of the THz camera's cost. We compared the cameras by characterizing THz beam profiles from two sources: a pulsed broadband THz beam produced through optical rectification in organic crystals, and a narrowband quasi-continuous-wave (quasi-CW) THz beam emitted by a quantum cascade laser. For the broadband THz radiation, the beam width measured by the two cameras differed by only ~ 6%, well within the pixel resolution limit, and in the narrowband quasi-CW case by just ~ 1.3%. Additionally, the IR camera exhibits a lower minimum detectable power (down to 1.5 THz) than the THz camera, while also maintaining a linear and polarization-independent responsivity. These results expand the applicability of conventional IR cameras to the THz range, suggesting that they will become routine tools for high-fidelity THz beam diagnostics and imaging in scientific and industrial applications.
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