Reflection and transmission filters have been constructed by the evaporation process, and their properties have been measured and shown to conform with the theory developed in Part I of this paper. A more extended set of curves of the reflection and transmission coefficients and the phase shift angles of a single metal film are given. From these curves, and from measurements made on the transmission filter, the optical constants of silver films are deduced and shown to be in agreement with other published data. A typical spectrogram of an infra-red reflection filter is also given, showing a minimum reflection coefficient of less than one percent at the odd overtones of the fundamental frequency.
© 1948 Optical Society of America
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