Abstract

Photoemission diode standards for accurately measuring monochromatic ultraviolet light intensity (3000 Å–1100 Å) are described that are also blind to visible light (λ > 3600 Å). The standard uses an opaque photocathode of Cs2Te and is unique because of its combination of thinness (19 mm), high sensitivity (Q.E. > 10%), time stability, and uniformity of response. Design criteria, construction methods, and difficulties overcome in obtaining a stable, unform, high yield photocathode responses are discussed. Cs2Te is discussed in terms of a model for high yield photoemitters.

© 1973 Optical Society of America

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