Time-stretch infrared spectroscopy

Autor: Takuro Ideguchi, Tadataka Edamura, Akira Kawai, Venkata Ramaiah Badarla, Tatsuo Dougakiuchi, Takayuki Imamura, Kazuki Hashimoto
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Communications Physics, Vol 3, Iss 1, Pp 1-6 (2020)
ISSN: 2399-3650
Popis: Improving the spectral acquisition rate of broadband mid-infrared spectroscopy promises further advancements of molecular science and technology. Unlike pump-probe spectroscopy, which requires repeated measurements with different pump-probe delays, continuous spectroscopy running at a high spectral acquisition rate enables transient measurements of fast non-repeating phenomena or statistical analysis of a large amount of spectral data. Recently, Fourier-transform infrared spectrometers with rapid delay scan mechanisms including dual-comb spectrometers have significantly improved the measurement rate up to ~1 MSpectra s−1 that is fundamentally limited by the signal-to-noise ratio. Here, we overcome the limit and demonstrate the fastest continuous broadband mid-infrared spectrometer running at 80 MSpectra s−1 by implementing a wavelength-swept time-stretch spectroscopy technique. Our proof-of-concept experiment demonstrates broadband absorption spectroscopy of phenylacetylene from 4.4 to 4.9 μm (2040–2270 cm−1) at a resolution of 15 nm (7.7 cm−1) with a signal-to-noise ratio of 85 without averaging and a shot-to-shot fluctuation of 1.3%. Decreasing the acquisition time of spectroscopies permits measurement of dynamic systems to be obtained at increasingly high speeds. Here, a time-stretch mid-infrared spectrometer is presented, operating at eighty million spectra per second and tested via absorption measurements of two molecular species.
Databáze: OpenAIRE
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