Gemini Wavefront Sensing Subsystems

Details Gemini Wavefront Sensing Subsystems Gemini Wavefront Sensing Subsystems

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4837..502b&link_type=abstract

Large Ground-based Telescopes. Edited by Oschmann, Jacobus M.; Stepp, Larry M. Proceedings of the SPIE, Volume 4837, pp. 502

Physics

Optics

Scientific paper

The Acquisition and Guiding Unit of the Gemini Telescope is able to support two major signal-processing functions: off axis active optics correction, and off axis fast guiding and focus. Both functions are performed by using up to two different Shack-Hartmann wavefront sensors working in the visible (called the Peripheral Wavefront Sensors). In addition to these wavefront sensors, each facility instrument includes its On Instrument Wavefront Sensor, which provides on or off axis fast guiding, and in some cases focus and astigmatism correction. In this paper, we will describe the different wavefront sensors and the results obtained in closed loop in terms of image quality and temporal performance.

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