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Upconversion time-stretch infrared spectroscopy

Light(Science & Applications) 2023年第3期12卷 465-474页

作者： Kazuki Hashimoto Takuma Nakamura Takahiro Kageyama Venkata Ramaiah Badarla Hiroyuki Shimada ryoich horisaki Takuro Ideguchi Institute for Photon Science and Technology The University of TokyoTokyo113-0033Japan Department of Physics The University of TokyoTokyo113-0033Japan Graduate School of Information Science and Technology The University of TokyoTokyo113-8656Japan

High-speed measurement confronts the extreme speed limit when the signal becomes comparable to the noise *** 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 ***-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 ***,it can measure no more than~30 spectral elements with a low resolution of several ***,we significantly increase the measurable number of spectral elements to more than 1000 by incorporating a nonlinear upconversion *** 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 *** 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 rreversible phenomena,statistically analyzing a large amount of heterogeneous spectral data,or taking broadband hyperspectral images at a high frame rate.

关键词： spectroscopy noise resolution

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