Accession Number : ADD000604

Title :   Large Aperture, Narrow-Band Detectors for Optical Communication Systems.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Rast,Howard E

Report Date : 02 Jul 1973

Pagination or Media Count : 8

Abstract : The patent application provides a sensitive detector means for the reception and detection of optical communication signals which are accompanied by ambient background radiation. An enclosure is provided containing a gas having a resonance energy separation, h nu sub 0, maintained at a pressure which optimizes its resonance radiation effect and maintains an optical density so that virtually all photons of frequency nu sub 0 are absorbed and re-emitted. Means are provided to minimize detection of noise photons by providing a baffle or light trap which will absorb all photons entering the aperture of the enclosure when no gas is present in the enclosure. A mirror is provided to reflect and focus photons through an aperture in the enclosure onto a detector. A provision of a large aperture narrow-band detector for optical communication systems is made for receiving and detecting optical communication with self-filtering to selectively detect the information while discriminating or rejecting background radiation.

Descriptors :   *Optical detectors, *Optical communications, Patents, Band pass filters, Apertures, Fluorescence, Signal to noise ratio, Signal processing, Photons

Subject Categories : Optical Detection and Detectors
      Optics
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE