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Phase-matched sum mixing of 10.6- and 1.06-μ radiation has been observed at near normal to the optic axis in ZnGeP2. Its theoretical performance as a 10.6-μ detector via up conversion compares favorably with direct detection by a cooled Ge:Hg photoconductive detector. The sum-mixing efficiency of ZnGeP2 is 140 times superior to that of Ag3AsS3, the next best material. The large angular aperture resulting from θm ≃ 90° indicates that the material will be useful for image up conversion.
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Boyd et al. (1971) studied this question.
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