Abstract
The subject of up-conversion in optically nonlinear crystals is reviewed. The characteristic properties of the detection of IR signals and images by frequency conversion to the visible and subsequent detection by a photocathode device are described. The way in which phase-matching normally restricts the spectral bandwidth to a few wavenumbers and the field of view to a few degrees is discussed. The conditions for achieving maximum image resolution are identified. Signal up-conversion should find application in the detection of weak IR radiation in astronomy and spectroscopy. Image up-conversion provides a novel “direct” method of viewing IR images. The ultimate temperature resolution when viewing a room temperature thermal scene is discussed.
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Warner, J. Parametric up-conversion from the infra-red. Opto-electronics 3, 37–48 (1971). https://doi.org/10.1007/BF01423512
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DOI: https://doi.org/10.1007/BF01423512