Wavelength-Tunable Quantum Absorption Spectroscopy in the Broadband Midinfrared Region
Wavelength-Tunable Quantum Absorption Spectroscopy in the Broadband Midinfrared Region
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DOI：
10.1103/physrevapplied.18.034015
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发表时间：
2022-09
影响因子：
4.6
通讯作者：
Masaya Arahata;Y. Mukai;T. Tashima;R. Okamoto;S. Takeuchi
中科院分区：
文献类型：
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作者：
Masaya Arahata;Y. Mukai;T. Tashima;R. Okamoto;S. Takeuchi
利用可见光-红外光子对产生过程之间的量子干涉，红外量子吸收光谱(IRQAS)能够从通过检测可见光光子获得的干涉图中估计红外区域中介质的光学性质。由于IRQAS无需在红外区域使用光源或探测器即可实现红外光谱分析，因此红外光谱仪可以变得更紧凑，侵入性更小，这将找到许多替代应用。更宽的光谱带宽是关键，然而，到目前为止，所报道的IRQAS系统的光谱带宽一直被限制在较小的范围内。在这里，我们报告了一个波长可调的IRQAS系统，覆盖了频谱范围，带宽为。在该系统中，通过旋转非线性晶体相对于泵浦光束来调谐自发参量下转换光子对的波长。以石英玻璃为样品，成功地进行了宽频带的快速光谱测量(粗扫描)，得到了清晰的展宽吸收带，与常规红外光谱仪的测量结果吻合较好。此外，对这些吸收带进行了高分辨率(精细扫描)的量子傅里叶变换红外光谱测量。所报道的超宽带IRQAS系统的概念为IRQAS在现实世界中的应用铺平了道路。
Harnessing the quantum interference between generation processes of visible-infrared photon pairs, infrared quantum absorption spectroscopy (IRQAS) enables the estimation of the optical properties of a medium in the infrared region from interferograms obtained by detecting visible photons. Since IRQAS enables infrared spectroscopy without using a light source or detector in the infrared region, infrared spectrometers can be made more compact and less invasive, which will find many alternative applications. A broader spectroscopy bandwidth is key, however, the spectral bandwidths of the reported IRQAS system have been limited to less thanso far. Here, we report a wavelength-tunable IRQAS system covering the spectral range ofwith a bandwidth of. In this system, the wavelengths of spontaneous parametric down-conversion photon pairs are tuned by rotating a nonlinear crystal with respect to the pump beam. Rapid spectral measurements (coarse scan) over a broad bandwidth () is successfully demonstrated using silica glass as a sample, and the obtained spectrum clearly shows-stretching absorption bands, which agreed well with the result measured by a conventional infrared spectrometer. Furthermore, quantum Fourier-transform infrared spectroscopy measurements are demonstrated for these absorption bands with a high resolution (fine scan). The reported concept of the ultrabroadband IRQAS system paves the way for the use of IRQAS in real-world applications.