| 4 | Upconversion time-stretch infrared spectroscopy显示文摘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-i.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 rreversible phenomena,statistically analyzing a large amount of heterogeneous spectral data,or taking broadband hyperspectral images at a high frame rate. | Kazuki Hashimoto Takuma Nakamura Takahiro Kageyama Venkata Ramaiah Badarla Hiroyuki Shimada Ryoich Horisaki Takuro Ideguchi | 2023 | Light(Science & Applications)2023，12，3： | 0 |
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