18 February 2013 Image processing and control of a programmable spatial light modulator for spatial beam shaping
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Programmable spatial shapers using liquid-crystal-based spatial-light-modulators in the National Ignition Facility lasers enable spatial shaping of the beam profile so that power delivered to the target can be maximized while maintaining system longevity. Programmable spatial shapers achieve three objectives: Introduce obscurations shadowing isolated flaws on downstream optical elements that could otherwise be affected by high fluence laser illumination; Spatial shaping to reduce beam peak-to-mean fluence variations to allow the laser to operate at higher powers so that maximum power can be delivered to the target; And finally gradually exposing the optical regions that have never seen laser light because they have always had shadowing from a blocker that is no longer needed. In this paper, we describe the control and image processing algorithms that determine beam shaping and verification of the beam profile. Calibration and transmittance mapping essential elements of controlling the PSS are described along with spatially nonlinear response of the device such as scale and rotation.
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Abdul A. S. Awwal, Abdul A. S. Awwal, Charles Orth, Charles Orth, Eddy Tse, Eddy Tse, JoAnn Matone, JoAnn Matone, Mitanu Paul, Mitanu Paul, Carla Hardy, Carla Hardy, Gordon Brunton, Gordon Brunton, Mark Hermann, Mark Hermann, Steve Yang, Steve Yang, J. M. M. DiNicola, J. M. M. DiNicola, Matt Rever, Matt Rever, Sham Dixit, Sham Dixit, John Heebner, John Heebner, "Image processing and control of a programmable spatial light modulator for spatial beam shaping", Proc. SPIE 8602, High Power Lasers for Fusion Research II, 86020A (18 February 2013); doi: 10.1117/12.2008542; https://doi.org/10.1117/12.2008542

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