
1.Institute for Photon Science and Technology, The University of Tokyo, Tokyo, 113-0033, Japan
2.Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan
3.Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, 113-8656, Japan
Takuro Ideguchi (ideguchi@ipst.s.u-tokyo.ac.jp)
Published:31 March 2023,
Published Online:4 March 2023,
Received:1 December 2022,
Revised:24 January 2023,
Accepted:5 February 2023
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Hashimoto K. et al. Upconversion time-stretch infrared spectroscopy. Light: Science & Applications, 12, 464-474 (2023).
Hashimoto K. et al. Upconversion time-stretch infrared spectroscopy. Light: Science & Applications, 12, 464-474 (2023). DOI: 10.1038/s41377-023-01096-4.
High-speed measurement confronts the extreme speed limit when the signal becomes comparable to the noise level. In the context of broadband mid-infrared spectroscopy
state-of-the-art ultrafast Fourier-transform infrared spectrometers
in particular dual-comb spectrometers
have improved the measurement rate up to a few MSpectra s
−1
which is limited by the signal-to-noise ratio. Time-stretch infrared spectroscopy
an emerging ultrafast frequency-swept mid-infrared spectroscopy technique
has shown a record-high rate of 80 MSpectra s
−1
with an intrinsically higher signal-to-noise ratio than Fourier-transform spectroscopy by more than the square-root of the number of spectral elements. However
it can measure no more than ~30 spectral elements with a low resolution of several cm
−1
. Here
we significantly increase the measurable number of spectral elements to more than 1000 by incorporating a nonlinear upconversion process. The one-to-one mapping of a broadband spectrum from the mid-infrared to the near-infrared telecommunication region enables low-loss time-stretching with a single-mode optical fiber and low-noise signal detection with a high-bandwidth photoreceiver. We demonstrate high-resolution mid-infrared spectroscopy of gas-phase methane molecules with a high resolution of 0.017 cm
−1
. This unprecedentedly high-speed vibrational spectroscopy technique would satisfy various unmet needs in experimental molecular science
e.g.
measuring ultrafast dynamics of irreversible phenomena
statistically analyzing a large amount of heterogeneous spectral data
or taking broadband hyperspectral images at a high frame rate.
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