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Proceedings Paper

Holographic electro-optic thin film stacks for airborne hyperspectral imaging
Author(s): Sameet K. Shriyan; Adam K. Fontecchio
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Paper Abstract

In this work we demonstrate the feasibility of using a holographically formed thin film electro-optic stack for the development of an airborne hyperspectral imaging system in the visible wavelength range of 600nm to 800nm. Each wavelength filtering element in the stack is formed by photo-induced phase separation of a homogenous mixture of liquid crystals and photopolymers, exhibiting a uniform reflection efficiency of up to 80% across a 35mm optical aperture with non-normalized baseline transmission, polarization insensitivity for normal incidence and a spectral resolution of 10nm. Fast switching time on the order of microseconds and techniques to improve view angle in the individual wavelength filtering elements in the stack are discussed and the improvements are discussed from a morphological standpoint. Two techniques for stacking the thin films have been developed which requires lesser number of substrates hence improving transmission throughput and radiometric efficiency through the stack. An advantage of using such a stack is the ability to modulate each wavelength filtering element at a different frequency to obtain a spectral multiplex, thereby enabling synchronous detection and demodulation of each wavelength with a high update rate for the hyperspectral cube. A system level integration of such a stack into the prototype drive and detection unit is discussed in this work.

Paper Details

Date Published: 13 August 2010
PDF: 8 pages
Proc. SPIE 7812, Imaging Spectrometry XV, 78120S (13 August 2010); doi: 10.1117/12.860727
Show Author Affiliations
Sameet K. Shriyan, Drexel Univ. (United States)
Adam K. Fontecchio, Drexel Univ. (United States)

Published in SPIE Proceedings Vol. 7812:
Imaging Spectrometry XV
Sylvia S. Shen; Paul E. Lewis, Editor(s)

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