Abstract
An imaging upconverter has been constructed which is suitable for use in the study of the thermal 10-μm radiation from astronomical sources. The infrared radiation is converted to visible radiation by mixing in a 1-cm-long proustite crystal. The phase-matched 2-cm−1 bandpass is tunable from 9 to 11 μm. The conversion efficiency is 2×10−7, and the field of view of 40 arc seconds on the sky contains several hundred picture elements, approximately diffraction-limited resolution in a large telescope. The instrument has been used in studies of the sun, moon, Mercury, and VY Canis Majoris.
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