Mr. Joseph D. Matchett Profile

Joseph D. Matchett

Mechanical Engineer at RL Associates Inc

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Proceedings Article | 14 September 2007 Paper

Volume holographic beam splitter for hyperspectral imaging applications

Joseph Matchett, Richard Billmers, Elizabeth Billmers, Mary Ludwig

Proceedings Volume 6668, 66680K (2007) https://doi.org/10.1117/12.733778

KEYWORDS: Beam splitters, Multiplexing, Volume holography, Diffraction gratings, Holography, Holograms, Diffraction, Prototyping, Sensors, Visible radiation

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RL Associates Inc. has designed a novel 12-channel, multi-spectral beam splitter which covers the visible region of the spectrum. Commonly-used beam splitting techniques include dichroic mirrors, spectral bandpass filters, ruled diffraction gratings, and prisms, all of which are large and difficult to handle. The RL Associates' beam splitter, developed for the US Navy's multi-spectral imaging programs, uses multiplexed volume holographic gratings. A volume holographic optical splitter offers multi-channel splitting in a single element which can be customized to accommodate a broad range of sensor array geometries. The RL Associates beam splitter has an efficiency of 75% or greater, and an angular acceptance of up to 25 degrees. These gratings are written in a thermally stable photosensitive glass. Currently, a 12-channel beam splitter has been developed by multiplexing three volume holograms in a 2x2 array with each element being offset by approximately 35 nm. The output of each element is then directed toward a separate imaging detector. Each detector is placed at a specific, unique position relative to the other detectors. This ensures that no cross talk occurs between beam splitting elements. A prototype beam splitter is currently under development. This beam splitter will extend into the short-wave infrared region while still working in the visible region.

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