Calibrating the interaction matrix for the LINC-NIRVANA high layer wavefront sensor

LINC-NIRVANA is a near-infrared Fizeau interferometric imager that will operate at the Large Binocular Telescope. In preparation for the commissioning of this instrument, we conducted experiments for calibrating the high-layer wavefront sensor of the layer-oriented multi-conjugate adaptive optics sy...

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Bibliographic Details
Published in:Optics express 2012-03, Vol.20 (7), p.8078-8092
Main Authors: Zhang, Xianyu, Arcidiacono, Carmelo, Conrad, Albert R, Herbst, Thomas M, Gaessler, Wolfgang, Bertram, Thomas, Ragazzoni, Roberto, Schreiber, Laura, Diolaiti, Emiliano, Kuerster, Martin, Bizenberger, Peter, Meschke, Daniel, Rix, Hans-Walter, Rao, Changhui, Mohr, Lars, Briegel, Florian, Kittmann, Frank, Berwein, Juergen, Trowitzsch, Jan
Format: Article
Language:English
Subjects:
Calibration
Interferometry - instrumentation
Photometry - instrumentation
Telescopes
Transducers
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Summary:LINC-NIRVANA is a near-infrared Fizeau interferometric imager that will operate at the Large Binocular Telescope. In preparation for the commissioning of this instrument, we conducted experiments for calibrating the high-layer wavefront sensor of the layer-oriented multi-conjugate adaptive optics system. For calibrating the multi-pyramid wavefront sensor, four light sources were used to simulate guide stars. Using this setup, we developed the push-pull method for calibrating the interaction matrix. The benefits of this method over the traditional push-only method are quantified, and also the effects of varying the number of push-pull frames over which aberrations are averaged is reported. Finally, we discuss a method for measuring mis-conjugation between the deformable mirror and the wavefront sensor, and the proper positioning of the wavefront sensor detector with respect to the four pupil positions.
ISSN:1094-4087
DOI:10.1364/OE.20.008078