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Proceedings Paper

Physical optics modeling and optimization of laser guide star propagation
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Paper Abstract

We use physical optics to simulate LGS propagation and imaging in a Shack-Hartmann wavefront sensor (WFS). We model different launch telescope (LT) sizes and realistic LT aberrations, the turbulent atmosphere, a sodium layer of finite thickness, the downlink propagation of the return light, an 8m-telescope, and finally the planned Very Large Telescope (VLT) Adaptive Optics Facility 40×40 GRAAL WFS. We study both long-exposure and instantaneous images on the WFS and compute spot size statistics. The results agree with observations obtained in the VLT telescope guider camera and enable us to optimize the LT diameter and devise design rules.

Paper Details

Date Published: 10 July 2008
PDF: 11 pages
Proc. SPIE 7015, Adaptive Optics Systems, 701521 (10 July 2008);
Show Author Affiliations
Ronald Holzlöhner, European Southern Observatory (Germany)
Domenico Bonaccini Calia, European Southern Observatory (Germany)
Wolfgang Hackenberg, European Southern Observatory (Germany)

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

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