23 July 2010 AO wavefront sensing detector developments at ESO
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Abstract
The detector is a critical component of any Adaptive Optics WaveFront Sensing (AO WFS) system. The required combination of fast frame rate, high quantum efficiency, low noise, large number and size of pixels, and low image lag can often only be met by specialized custom developments. ESO's very active WFS detector development program is described. Key test results are presented for newly developed detectors: a) the e2v L3Vision CCD220 (the fastest/lowest noise AO detector to date) to be deployed soon on 2nd Generation VLT instruments, and b) the MPI-HLL pnCCD with its superb high "red" response. The development of still more advanced laser/natural guide-star WFS detectors is critical for the feasibility of ESO's EELT. The paper outlines: a) the multi-phased development plan that will ensure detectors are available on-time for EELT first-light AO systems, b) results of design studies performed by industry during 2007 including a comparison of the most promising technologies, c) results from CMOS technology demonstrators that were built and tested over the past two years to assess and validate various technologies at the pixel level, their fulfillment of critical requirements (especially read noise and speed), and scalability to full-size. The next step will be towards Scaled-Down Demonstrators (SDD) to retire architecture and process risks. The SDD will be large enough to be used for E-ELT first-light AO WFS systems. For full operability, 30-50 full-scale devices will be needed.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark Downing, Johann Kolb, Dietrich Baade, Olaf Iwert, Norbert Hubin, Javier Reyes, Philippe Feautrier, Jean-Luc Gach, Philippe Balard, Christian Guillaume, Eric Stadler, Yves Magnard, "AO wavefront sensing detector developments at ESO", Proc. SPIE 7742, High Energy, Optical, and Infrared Detectors for Astronomy IV, 774204 (23 July 2010); doi: 10.1117/12.856119; https://doi.org/10.1117/12.856119
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