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Proceedings Paper

Concept for laser guide star dynamic refocusing using rotating phase plates
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Paper Abstract

Laser guide star wavefront sensors (WFS) using pulsed lasers can benefit from dynamic refocusing techniques which synchronously adjust the focus of the wavefront as the light returns from the scattering layer so as to maintain a constant axial image location. Existing techniques involve pulsating discrete mirrors and high-speed segmented MEMS in the WFS path. A different approach is presented here, which uses a pair of rotating phase plates with cylindrical or Alvarezlens- style tracks near the WFS pupil. Rotational speeds and disk sizes similar to that used for compact disc operation are proposed. The plates can be manufactured by numerical machining of transparent plastic materials or as diffractive components.

Paper Details

Date Published: 11 July 2008
PDF: 9 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70151M (11 July 2008); doi: 10.1117/12.789893
Show Author Affiliations
Brian J. Bauman, Lawrence Livermore National Lab. (United States)
Steven Ebstein, Lexitek, Inc. (United States)

Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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