Physics – Optics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.368.1796r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 368, Issue 4, pp. 1796-1802.
Physics
Optics
Instrumentation: Adaptive Optics, Telescopes
Scientific paper
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.
Diolaiti Emiliano
Farinato Jacopo
Gaessler Wolfgang
Kellner Stephan
Ragazzoni Roberto
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