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11 September 1998 Absolute tilt recovery from LGSs: a case study
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrea Baruffolo, Jacopo Farinato, and Roberto Ragazzoni "Absolute tilt recovery from LGSs: a case study", Proc. SPIE 3353, Adaptive Optical System Technologies, (11 September 1998);

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