Absolute tilt recovery from LGSs: a case study

Details Absolute tilt recovery from LGSs: a case study Absolute tilt recovery from LGSs: a case study

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3353..340b&link_type=abstract

Proc. SPIE Vol. 3353, p. 340-346, Adaptive Optical System Technologies, Domenico Bonaccini; Robert K. Tyson; Eds.

Computer Science

1

Scientific paper

VLT is taken as a case study for the tilt retrieving scheme from a laser guide star using the auxiliary telescopes techniques. Assuming that the auxiliary apertures can be moved anywhere on the set of rails surrounding the four VLT units, the corresponding patch on the sky useful to find out a suitable natural guide star for tracking purposes is evaluated. This is accomplished taking into account both the thickness of the sodium layer and the isoplanatic patch size that one can reasonably expected under good seeing conditions at the telescope site. It is shown that the useful patch area to be looked for NGSs rotates and changes in shape in the sky during the observation of a single target. The sky coverages estimated for two cases are given, this allows to trace some preliminary conclusions on the feasibility of such tilt retrieving scheme.

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