19 March 2013 Comparing adaptive optics approaches for NASA LCRD Ground Station #2
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Abstract
NASA’s Laser Communication Relay Demonstration (LCRD) aims to demonstrate a geosynchronous satellite laser communications (lasercom) relay between two independent ground terminals. We report on the design of two adaptive optics (AO) techniques for LCRD Ground Station #2 (GS-2). GS-2 leverages the ground terminal developed for NASA’s Lunar Laser Communications Demonstration (LLCD). Equipping GS-2’s 40cm diameter receive telescope with AO to mitigate atmospheric turbulence effects will enable the use of single mode, optically preamplified receivers for high data-rate near-Earth relay applications. In this work a direct wavefront sensing AO approach using a Shack-Hartmann sensor and a continuous facesheet micro-electro-mechanical system (MEMS) deformable mirror (DM) was compared with an indirect sensing, hill-climbing or multidither approach using a segmented MEMS DM. Design concepts and recent experimental progress for the two approaches are presented.
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Jason B. Stewart, Jason B. Stewart, Daniel V. Murphy, Daniel V. Murphy, John D. Moores, John D. Moores, Andrew S. Fletcher, Andrew S. Fletcher, Keith M. Bonneau, Keith M. Bonneau, } "Comparing adaptive optics approaches for NASA LCRD Ground Station #2", Proc. SPIE 8610, Free-Space Laser Communication and Atmospheric Propagation XXV, 86100M (19 March 2013); doi: 10.1117/12.2010126; https://doi.org/10.1117/12.2010126
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