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Wavelength-Tunable Quantum Absorption Spectroscopy in the Broadband Midinfrared Region

Masaya Arahata1, Yu Mukai1, Toshiyuki Tashima1, Ryo Okamoto1,2, and Shigeki Takeuchi1,*

  • 1Department of Electronic Science and Engineering, Kyoto University, Kyotodaigakukatsura, Nishikyo-ku, Kyoto 615-8510, Japan
  • 2Japan Science and Technology Agency, PRESTO, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan

  • *takeuchi@kuee.kyoto-u.ac.jp
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Phys. Rev. Applied 18, 034015 – Published 7 September, 2022

DOI: https://doi.org/10.1103/PhysRevApplied.18.034015

Abstract

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 than 1μm so far. Here, we report a wavelength-tunable IRQAS system covering the spectral range of 1.9–5.2μm with a bandwidth of 3.3μm. 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 (1.9–5.2μm) is successfully demonstrated using silica glass as a sample, and the obtained spectrum clearly shows OH-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.

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Phys. Rev. Applied 18, 034015– Published 7 September, 2022
  • Received 22 March 2022
  • Accepted 1 August 2022
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