A schematic of upconversion time-stretch infrared spectroscopy (IMAGE)

School of Science, The University of Tokyo

A schematic of upconversion time-stretch infrared spectroscopy

Caption

First, the sample is illuminated with infrared light. After the light interacts with the sample, the resulting wavelengths are ‘upconverted’ from low-energy infrared to high-energy near-infrared wavelength. The near-infrared pulses then travel through an optical fiber which essentially “stretches” the pulse in time. A near-infrared photodetector detects the pulses. The inset in the bottom left corner shows the transmittance spectra of gaseous CH4 molecules at three consecutive time points.

Credit

Hashimoto et. al. 2023

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License

CC BY

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