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Proceedings Paper

Multiple-aperture averaging technique for measuring full aperture tilt with a laser guide star
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Paper Abstract

A method for measuring full aperture tilt with a laser guide star (LGS) is described. The method uses a single monochromatic LGS formed by a laser beam transmitted through the main telescope and two arrays of small auxiliary telescopes separated from the main telescope in transverse directions. To achieve the Strehl ratio required for practical adaptive optics (AO) systems, the method uses an averaging of the LGS image over the position of the auxiliary telescope in the telescope array and over position of a subaperture within the auxiliary telescope, along with integration over FOV of the receiver and over time. I show that the contribution of the down propagation path can be considerably reduced by increasing the number of auxiliary telescopes and the number of subapertures, as well as by time integration. With this method Strehl ratio equal to 0.7 can be achieved for various seeing conditions, telescope diameter, and wavelength, including a visible waveband.

Paper Details

Date Published: 17 October 1997
PDF: 12 pages
Proc. SPIE 3126, Adaptive Optics and Applications, (17 October 1997); doi: 10.1117/12.290142
Show Author Affiliations
Mikhail S. Belen'kii, Georgia Tech Research Institute (United States)

Published in SPIE Proceedings Vol. 3126:
Adaptive Optics and Applications
Robert K. Tyson; Robert Q. Fugate, Editor(s)

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