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Proceedings Paper

Status report of PYRAMIR: a near-infrared pyramid wavefront sensor for ALFA
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Paper Abstract

A new wavefront sensor based on the pyramid principle is being built at MPIA, with the objective of integration in the Calar Alto adaptive optics system ALFA. This sensor will work in the near-infrared wavelength range (J, H and K bands). We present here an update of this project, named PYRAMIR, which will have its first light in some months. Along with the description of the optical design, we discuss issues like the image quality and chromatic effects due to band sensing. We will show the characterization of the tested pyramidal components as well as refer to the difficulties found in the manufacturing process to meet our requirements. Most of the PYRAMIR instrument parts are kept inside a liquid nitrogen cooled vacuum dewar to reduce thermic radiation. The mechanical design of the cold parts is described here. To gain experience, a laboratory pyramid wavefront sensor was set up, with its optical design adapted to PYRAMIR. Different tests were already performed. The electronic and control systems were designed to integrate in the existing ALFA system. We give a description of the new components. An update on the future work is presented.

Paper Details

Date Published: 25 October 2004
PDF: 11 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551713
Show Author Affiliations
Joana Buechler Costa, Max-Planck-Institut fur Astronomie (Germany)
Markus Feldt, Max-Planck-Institut fur Astronomie (Germany)
Karl Wagner, Max-Planck-Institut fur Astronomie (Germany)
Peter Bizenberger, Max-Planck-Institut fur Astronomie (Germany)
Stefan Hippler, Max-Planck-Institut fur Astronomie (Germany)
Harald Baumeister, Max-Planck-Institut fur Astronomie (Germany)
Micaela Stumpf, Max-Planck-Institut fur Astronomie (Germany)
Roberto Ragazzoni, Max-Planck-Institut fur Astronomie (Germany)
INAF, Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Thomas Henning, Max-Planck-Institut fur Astronomie (Germany)

Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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