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Proceedings Paper

Tunable Spectral Filters
Author(s): I. C. Chang
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Paper Abstract

This paper discusses the theory and practice of tunable spectral filters, particularly the types that operate on the principle of light interference and diffraction in a birefringent crystal. Three methods of tuning are described: acousto-optic (AOTF), electro-optical (EOTF) and electromechanical (Solc). Capabilities and limitations of all three are compared. The AOTF is most versatile, is simple to construct, and can be rapidly tuned. Due to its relatively high drive power for mosaic sensor applications AOTF has been limited to a small portion of the focal plane (e.g., for laser warning). In principle, the EOTF has the advantage of low drive power. However, because of the material problems and fabrication complexity involved, practical implementation on the focal plane is probably many years away. For near-term mosaic sensor requirements, the electromechanically tuned Solc appears to be the most promising solution.

Paper Details

Date Published: 18 February 1981
PDF: 9 pages
Proc. SPIE 0244, Mosaic Focal Plane Methodologies I, (18 February 1981); doi: 10.1117/12.959318
Show Author Affiliations
I. C. Chang, Applied Technology, A Division of Itek Corporation (United States)


Published in SPIE Proceedings Vol. 0244:
Mosaic Focal Plane Methodologies I
William S. Chan, Editor(s)

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