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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 308602.0, MPI für Astronomie / Publikationen_mpia
Pseudo-infinite guide stars for multi-conjugated adaptive optics on extremely large telescopes
Authors:Ragazzoni, R.; Kellner, S.; Gaessler, W.; Diolaiti, E.; Farinato, J.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Volume:368
Start Page:1796
End Page:1802
Audience:Not Specified
Abstract / Description:We introduce a novel concept to sense the wavefront for adaptive optics purposes in astronomy using a conventional laser beacon. The concept we describe involves treating the light scattered in the mesospheric sodium layer as if it comes from multiple rings located at infinity. Such a concept resembles an inverse Bessel beam and is particularly suitable for multi-conjugated adaptive optics on extremely large telescopes. In fact, as the sensing process uses light apparently coming from infinity, some problems linked to the finite distance and vertical extent of the guide source are solved. Since such a technique is able to sense a wavefront solely in the radial direction, we propose furthermore a novel wavefront sensor by combining the inverse Bessel beam approach with the recently introduced z-invariant technique for a pseudo-infinite guide star sensor.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi...
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