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Proceedings Article

Sub-μrad laser beam tracking

[+] Author Affiliations
Ivo Buske, Wolfgang Riede

German Aerospace Ctr. (Germany)

Proc. SPIE 6397, Technologies for Optical Countermeasures III, 63970J (October 05, 2006); doi:10.1117/12.690424
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From Conference Volume 6397

  • Technologies for Optical Countermeasures III
  • David H. Titterton
  • Stockholm, Sweden | September 11, 2006

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.

© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Ivo Buske and Wolfgang Riede
"Sub-μrad laser beam tracking", Proc. SPIE 6397, Technologies for Optical Countermeasures III, 63970J (October 05, 2006); doi:10.1117/12.690424; http://dx.doi.org/10.1117/12.690424


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