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Proceedings Paper

Sub-µrad laser beam tracking
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Paper Abstract

We compare active optical elements based on different technologies to accomplish the requirements of a 2-dim. fine tracking control system. A cascaded optically and electrically addressable spatial light modulator (OASLM) based on liquid crystals (LC) is used for refractive beam steering. Spatial light modulators provide a controllable phase wedge to generate a beam deflection. Additionally, a tip/tilt mirror approach operating with piezo-electric actuators is investigated. A digital PID controller is implemented for closed-loop control. Beam tracking with a root-mean-squared accuracy of Δα=30 nrad has been laboratory-confirmed.

Paper Details

Date Published: 5 October 2006
PDF: 7 pages
Proc. SPIE 6397, Technologies for Optical Countermeasures III, 63970J (5 October 2006); doi: 10.1117/12.690424
Show Author Affiliations
Ivo Buske, German Aerospace Ctr. (Germany)
Wolfgang Riede, German Aerospace Ctr. (Germany)


Published in SPIE Proceedings Vol. 6397:
Technologies for Optical Countermeasures III
David H. Titterton, Editor(s)

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