Accession Number : ADD013341

Title :   Multi-Color Tunable Filter.

Descriptive Note : Patent, Filed 14 Apr 80, patented 21 Sep 82,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bottka, Nicholas ; Lessoff, Howard

Report Date : 21 Sep 1982

Pagination or Media Count : 4

Abstract : A semi-conductor multi-color tunable filter is created by multi epitaxial layers composition. An AC modulation voltage is superimposed on a sweep bias to periodically shift the fundamental absorption edge of each individual epitaxial layer. This arrangement permits a unique voltage to be associated with a particular color. A lock-in filter matches colors observed at a detector with the voltage present for a given observation.

Descriptors :   *PATENTS, *ABSORPTION, *EPITAXIAL GROWTH, *FILTERS, *SEMICONDUCTORS, *TUNING, ALTERNATING CURRENT, COLORS, EDGES, LAYERS, MODULATION, VOLTAGE

Subject Categories : Optics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE