Abstract
Room-temperature thermal (blackbody) radiation has been detected via parametric-frequency upconversion. Thermal radiation was mixed with the output of a Nd:YAG laser in proustite. The wavelength of the radiation upconverted was varied from 6.5 to 12.5 μ by rotating the proustite 20 deg. The spectral width of the blackbody radiation accepted by the upconverter was approximately 0.7 μ.
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