Spectrally Selective Photodetectors for the Middle and Vacuum Ultraviolet

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Abstract
A number of “solar blind” photosurfaces have been developed in recent years. Measurements made on phototubes having photocathodes of rubidium telluride, cesium telluride, cesium iodide, and copper iodide are described. Cathode quantum efficiencies for semitransparent cathodes of rubidium or cesium telluride range from 10−1 to 10−2 electrons/quantum in the middle and vacuum ultraviolet, with long wavelength responses of less than 10−4 electrons/quantum beyond about 3500 Å. By combining “solar blind” cathodes with windows of LiF, CaF2, or fused silica, detectors with relatively flat quantum yields can be produced, marked by high sensitivities in specific ultraviolet spectral regions and by very low sensitivities at all longer wavelengths.

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