Abstract

Photoelectric emission is matched to optical absorption through the use of thin-film equations to explain the variation in angular response of alkali-bearing photocathodes at angles of incidence from 0 to 60°. The nearly exact match shows that the relationship between optical absorption and photoemission is linear. This matching ability also permits direct determination of the optical constants of an unknown film and in addition permits the calculation of the quantum efficiency of the absorbing layer.

© 1992 Optical Society of America

Optical absorption and photoemission in semitransparent and opaque Cs₃Sb photocathodes

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