Abstract

A discussion is given of the present existing limits of usefulness of the various prisms commonly employed in the infra-red. A new method for extending some of these limits is proposed. This method, based upon the disappearance of newly found secondary absorption maxima at low temperatures, would require that prisms of the alkali halides be used while cooled with liquid air. A possible spectrometer for this purpose is presented. Transmission curves for LiF crystals are given which show that a prism of this material would be useful to about 6μ.

© 1938 Optical Society of America

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