Abstract

An experimental device successfully upconverts ir radiation in the 3.2–5.0-μm wavelength range simultaneously to “visible” light at 0.80–0.88 μm, while preserving frequency coding and is thus applicable to ir spectroscopy. The 1.8-μm bandwidth of ir radiation that is upconverted without temperature or phase match tuning is the largest yet reported. The over-all system quantum efficiency of the upconverter/spectrometer system is 0.01% and could be improved to 0.4%.

© 1978 Optical Society of America

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