USA As Represented by Secretary of the Navy

Hubert H Caspers

Howard E Rast

Howard E Rast, Jr

Narrow-band detection of optical signals over a large field of view wherein the selective reflecting power of metallic vapors is employed. A modulated carrier signal to be detected is directed to a Brewster window of an enclosure containing a vapor such as mercury. Only the incident light of interest is reflected through an exit window and detected by means of a photo-multiplier.

Wide aperture optical communications detector

A method and means for coupling information or signal power into or out of iber optics for integrated optical waveguides. The coupling consists of selectively doping with impurity ions such as rare earth or transition metal ions which are excited to fluorescence within the waveguide by the frequency of the transmitted carrier wave. The fluorescent emission is then detected at right angles to the fiber using conventional photodetectors and amplifiers.

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La Mesa, CA, United States of America

Hubert H Caspers