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Proceedings Paper

Image processing and control of a programmable spatial light modulator
Author(s): Abdul A. S. Awwal; Richard Leach; Gordon Brunton; Eddy Tse; JoAnn Matone; John Heebner
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Paper Abstract

The heart of the National Ignition Facility is a megajoule-class laser system consisting of 192 beams used to drive inertial confinement fusion reactions. A recently installed system of programmable, liquid-crystal-based spatial light modulators adds the capability of arbitrarily shaping the spatial beam profiles in order to enhance operational flexibility. Its primary intended use is for introducing "blocker" obscurations shadowing isolated flaws on downstream optical elements that would otherwise be damaged by high fluence laser illumination. Because an improperly shaped blocker pattern can lead to equipment damage, both the position and shape of the obscurations must be carefully verified prior to high-fluence operations. An automatic alignment algorithm is used to perform detection and estimation of the imposed blocker centroid positions compared to their intended locations. Furthermore, in order to minimize the spatially-varying nonlinear response of the device, a calibration of the local magnification is performed at multiple sub-image locations. In this paper, we describe the control and associated image processing of this device that helps to enhance the safety and longevity of the overall system.

Paper Details

Date Published: 18 February 2011
PDF: 11 pages
Proc. SPIE 7916, High Power Lasers for Fusion Research, 79160Q (18 February 2011); doi: 10.1117/12.876399
Show Author Affiliations
Abdul A. S. Awwal, Lawrence Livermore National Lab. (United States)
Richard Leach, Lawrence Livermore National Lab. (United States)
Gordon Brunton, Lawrence Livermore National Lab. (United States)
Eddy Tse, Lawrence Livermore National Lab. (United States)
JoAnn Matone, Lawrence Livermore National Lab. (United States)
John Heebner, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 7916:
High Power Lasers for Fusion Research
Abdul A. S. Awwal; A. Mike Dunne; Hiroshi Azechi; Brian E. Kruschwitz, Editor(s)

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