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Abstract

An atomic resonance filter device. The device includes a bulbous shaped cell containing atomic vapor which converts narrow band received light into longer wavelength photons which are collected by an integrated sphere like housing and a spatial collecting cone to which passes the longer wavelength photons to a photodector. The housing has an inner reflective surface or coating which reflects received light and converted light frequencies. The housing opening is covered with a filter that passes the received light and blocks the spectrum of converted light. The inner surface of the filter is coated with a coating highly reflective to converted light. A light collecting cone with a cylindrical body portion is centrally positioned in the bottom of the cesium cell on the surface of the housing opposite the housing opening and the cylindrical portion passes through the wall of the housing to the exterior. Collecting cone improves light collection to the photodetector by about 50%. A filter that passes the converted light and reflects the received light is positioned between the output end of the light collecting cone exterior of the housing and a photodetector tube so that only converted light is received by the photodetector. The photodetector produces electrical signals related to information carried by the received light frequency.

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