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Proceedings Paper

MOIRE: ground demonstration of a large aperture diffractive transmissive telescope
Author(s): Paul Atcheson; Jeanette Domber; Kevin Whiteaker; Jerald A. Britten; Shamasundar N. Dixit; Brandon Farmer
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Paper Abstract

The desire to field space-based telescopes with apertures in excess of 10 meter diameter is forcing the development of extreme lightweighted large optomechanical structures. Sparse apertures, shell optics, and membrane optics are a few of the approaches that have been investigated and demonstrated. Membrane optics in particular have been investigated for many years. The MOIRE approach in which the membrane is used as a transmissive diffractive optical element (DOE) offers a significant relaxation in the control requirements on the membrane surface figure, supports extreme lightweighting of the primary collecting optic, and provides a path for rapid low cost production of the primary optical elements. Successful development of a powered meter-scale transmissive membrane DOE was reported in 2012. This paper presents initial imaging results from integrating meter-scale transmissive DOEs into the primary element of a 5- meter diameter telescope architecture. The brassboard telescope successfully demonstrates the ability to collect polychromatic high resolution imagery over a representative object using the transmissive DOE technology. The telescope includes multiple segments of a 5-meter diameter telescope primary with an overall length of 27 meters. The object scene used for the demonstration represents a 1.5 km square complex ground scene. Imaging is accomplished in a standard laboratory environment using a 40 nm spectral bandwidth centered on 650 nm. Theoretical imaging quality for the tested configuration is NIIRS 2.8, with the demonstration achieving NIIRS 2.3 under laboratory seeing conditions. Design characteristics, hardware implementation, laboratory environmental impacts on imagery, image quality metrics, and ongoing developments will be presented.

Paper Details

Date Published: 28 August 2014
PDF: 15 pages
Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91431W (28 August 2014); doi: 10.1117/12.2054104
Show Author Affiliations
Paul Atcheson, Ball Aerospace & Technologies Corp. (United States)
Jeanette Domber, Ball Aerospace & Technologies Corp. (United States)
Kevin Whiteaker, Ball Aerospace & Technologies Corp. (United States)
Jerald A. Britten, Lawrence Livermore National Lab. (United States)
Shamasundar N. Dixit, Lawrence Livermore National Lab. (United States)
Brandon Farmer, NeXolve Corp. (United States)

Published in SPIE Proceedings Vol. 9143:
Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann Jr.; Mark Clampin; Giovanni G. Fazio; Howard A. MacEwen, Editor(s)

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