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