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

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

A schematic of upconversion time-stretch infrared spectroscopy (UC-TSIR).

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

by Kazuki Hashimoto, Takuma Nakamura, Takahiro Kageyama, Venkata Ramaiah Badarla, Hiroyuki Shimada, Ryoich Horisaki, and Takuro Ideguchi

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License

CC BY

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