Concept for laser guide star dynamic refocusing using rotating phase plates

Brian J. Bauman; Steven Ebstein

doi:10.1117/12.789893

11 July 2008 Concept for laser guide star dynamic refocusing using rotating phase plates

Brian J. Bauman, Steven Ebstein

Proceedings Volume 7015, Adaptive Optics Systems; 70151M (2008) https://doi.org/10.1117/12.789893
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

Brian J. Bauman and Steven Ebstein "Concept for laser guide star dynamic refocusing using rotating phase plates", Proc. SPIE 7015, Adaptive Optics Systems, 70151M (11 July 2008); https://doi.org/10.1117/12.789893

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