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25 October 2004 Status report of PYRAMIR: a near-infrared pyramid wavefront sensor for ALFA
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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.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joana Buechler Costa, Markus Feldt, Karl Wagner, Peter Bizenberger, Stefan Hippler, Harald Baumeister, Micaela Stumpf, Roberto Ragazzoni, Simone Esposito, and Thomas Henning "Status report of PYRAMIR: a near-infrared pyramid wavefront sensor for ALFA", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004);

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