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Proceedings Paper

Laser guide star: monitoring and light pollution
Author(s): Nancy Ageorges; R. Michael Redfern; Francoise Delplancke; Creidhe O'Sullivan
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Paper Abstract

This paper summarizes three years of observations of the resonant optical backscatter of laser, used to produce a mesospheric sodium-layer laser guide star for an adaptive optics system. Observations were obtained from a neighboring telescope. The aim of this work was two-fold: to study the Na plume (altitude and profile variations) and to study the Rayleigh cone in order to achieve scattering measurements relevant to the light pollution created by a sodium laser guide star. We report on the short-term characteristics of the sodium layer and stress the consequences of these variations for Laser Guide Star Adaptive Optics System operations. From the measurements of the background intensity measured while observing the laser guide star and the top of the Rayleigh cone, we can derive information on the light pollution produced by the laser as well as the resulting implications for an observatory laser management policy. Information on the laser intensity, size and shape along the Rayleigh cone are also presented.

Paper Details

Date Published: 7 July 2000
PDF: 11 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390336
Show Author Affiliations
Nancy Ageorges, National Univ. of Ireland/Galway (Chile)
R. Michael Redfern, National Univ. of Ireland/Galway (Ireland)
Francoise Delplancke, European Southern Observatory (Belgium)
Creidhe O'Sullivan, National Univ. of Ireland/Galway (Ireland)

Published in SPIE Proceedings Vol. 4007:
Adaptive Optical Systems Technology
Peter L. Wizinowich, Editor(s)

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