Multicolor Time‐Resolved Upconversion Imaging by Adiabatic Sum Frequency Conversion,Laser & Photonics Reviews

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Multicolor Time‐Resolved Upconversion Imaging by Adiabatic Sum Frequency Conversion
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-08-20 , DOI: 10.1002/lpor.202000040
Michael Mrejen ₁ , Yoni Erlich ₁ , Assaf Levanon ₁ , Haim Suchowski ₁

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Upconversion imaging, where mid‐infrared (IR) photons are converted to visible and near‐IR photons via a nonlinear crystal and detected on cheap and high‐performance silicon detectors, is an appealing method to address the limitations of thermal sensors that are expensive, often require cooling, and suffer from both limited spectral response and limited spatial resolution as well as poor sensitivity. However, phase matching severely limits the spectral bandwidth of this technique, therefore requiring serial acquisitions in order to cover a large spectrum. Here, a novel upconversion imaging scheme covering the mid‐IR based on adiabatic frequency conversion is introduced. The study presents mid‐IR multicolor imaging and demonstrates simultaneous imaging on a complementary metal–oxide–semiconductor (CMOS) camera of radiation spanning a spectrum from 2 to 4 µm. This approach being coherent and ultrafast in essence, spectrally resolved spatiotemporal imaging is further demonstrated that allows spatially distinguishing the temporal evolution of spectral components.

中文翻译：

绝热和频转换的多色时间分辨上变频成像

上转换成像是一种吸引人的方法，可解决昂贵的热传感器的局限性，在这种方法中，红外光子通过非线性晶体转换为可见光和近红外光子，并在廉价且高性能的硅探测器上进行检测，通常需要冷却，并且光谱响应和空间分辨率均受限，并且灵敏度较差。但是，相位匹配严重限制了该技术的频谱带宽，因此需要进行串行采集才能覆盖大频谱。在此，介绍了一种基于绝热频率转换的覆盖中红外的新型上变频成像方案。这项研究提出了中红外多色成像，并演示了在互补金属氧化物半导体（CMOS）相机上同时成像的辐射范围为2到4 µm。这种方法本质上是连贯且超快的，进一步证明了光谱分辨的时空成像可以在空间上区分光谱成分的时间演化。

更新日期：2020-10-08

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