Abstract

Operating under the condition of energy-limited resolution in the infrared, the Fabry-Perot interferometer is shown to have a theoretical advantage by a factor of about 5 in. resolving power over the diffraction grating. Tellurium films which have a high index of refraction in the infrared are shown to absorb little energy from 5 to 20 microns. Multilayer films of tellurium and potassium bromide show high reflection and low absorption, appearing to be well suited for interferometer films. Tellurium is also shown to be suitable for filters for use in the region 5 to 25 microns.

© 1955 Optical Society of America

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