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Increasing the sensitivity of a Shack-Hartmann sensor

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arxiv 1607.05575 v1 pith:5ID2ZD5R submitted 2016-07-19 astro-ph.IM

Markus Kasper , Douglas Looze , Stefan Hippler , Ric Davies , Andreas Glindemann This is my paper · ORCID
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keywords guidealfafaintincreasinglasersensitivitysensorshack-hartmann
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The Max-Planck institutes for astronomy (MPIA) and for extraterrestrial physics (MPE) run an adaptive optics (AO) system with a laser guide star at the 3.5 m telescope on Calar Alto, Spain. This system, called ALFA, produces now scientific results and works ex- cellent with natural guide stars (NGS) as faint as 13th magnitude in R-band. The ultimate goal however is to achieve similar performances with the laser guide star (LGS) which is faint and extended. We introduce the Shack-Hartmann wavefront sensor implemented in ALFA and present our efforts in increasing its sensitivity by using advanced centroiding and wavefront reconstruction algorithms.

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