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Updated: Feb 25, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Compact broadband high-resolution infrared spectrometer with a dihedral reflector
Abstract:
We demonstrate a compact broadband high-resolution spectrometer approach. A dihedral reflector is used to reflect the dispersed light back to the grating for a second diffraction, folding the light path in a compact space, and enhancing the spectral resolution. The theoretical formulas for the system are strictly derived. In addition, a prototype of this spectrometer for fiber communication in the infrared wavelength range has been built. The optics can fit inside a volume of 12 cm × 14 cm × 5 cm and its spectral resolution is 57 pm over a wide wavelength range from 1250 nm to 1650 nm.
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