Tunable Spectral Filters

I. C. Chang

doi:10.1117/12.959318

18 February 1981 Tunable Spectral Filters

I. C. Chang

Proceedings Volume 0244, Mosaic Focal Plane Methodologies I; (1981) https://doi.org/10.1117/12.959318
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

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.

Citation Download Citation

I. C. Chang "Tunable Spectral Filters", Proc. SPIE 0244, Mosaic Focal Plane Methodologies I, (18 February 1981); https://doi.org/10.1117/12.959318

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KEYWORDS

Optical filters

Modulation

Tunable filters

Acoustics

Crystals

Bandpass filters

Absorption filters

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