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Proceedings Paper

Backside-illuminated, high-QE, 3e- RoN, fast 700fps, 1760x1680 pixels CMOS imager for AO with highly parallel readout
Author(s): Mark Downing; Johann Kolb; Dietrich Baade; Philippe Balard; Bart Dierickx; Arnaud Defernez; Benoit Dupont; Philippe Feautrier; Gert Finger; Martin Fryer; Jean-Luc Gach; Christian Guillaume; Norbert Hubin; Olaf Iwert; Paul Jerram; Paul Jorden; Andrew Pike; Jerome Pratlong; Javier Reyes; Eric Stadler; Andrew Walker
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Paper Abstract

The success of the next generation of instruments for 8 to 40-m class telescopes will depend upon improving the image quality (correcting the distortion caused by atmospheric turbulence) by exploiting sophisticated Adaptive Optics (AO) systems. One of the critical components of the AO systems for the E-ELT has been identified as the Laser/Natural Guide Star (LGS/NGS) WaveFront Sensing (WFS) detector. The combination of large format, 1760x1680 pixels to finely sample (84x84 sub-apertures) the wavefront and the spot elongation of laser guide stars, fast frame rate of 700 (up to 1000) frames per second, low read noise (< 3e-), and high QE (> 90%) makes the development of such a device extremely challenging. Design studies by industry concluded that a thinned and backside-illuminated CMOS Imager as the most promising technology. This paper describes the multi-phased development plan that will ensure devices are available on-time for E-ELT first-light AO systems; the different CMOS pixel architectures studied; measured results of technology demonstrators that have validated the CMOS Imager approach; the design explaining the approach of massive parallelism (70,000 ADCs) needed to achieve low noise at high pixel rates of ~3 Gpixel/s ; the 88 channel LVDS data interface; the restriction that stitching (required due to the 5x6cm size) posed on the design and the solutions found to overcome these limitations. Two generations of the CMOS Imager will be built: a pioneering quarter sized device of 880x840 pixels capable of meeting first light needs of the E-ELT called NGSD (Natural Guide Star Detector); followed by the full size device, the LGSD (Laser Guide Star Detector). Funding sources: OPTICON FP6 and FP7 from European Commission and ESO.

Paper Details

Date Published: 25 September 2012
PDF: 13 pages
Proc. SPIE 8453, High Energy, Optical, and Infrared Detectors for Astronomy V, 84530C (25 September 2012); doi: 10.1117/12.925616
Show Author Affiliations
Mark Downing, European Southern Observatory (Germany)
Johann Kolb, European Southern Observatory (Germany)
Dietrich Baade, European Southern Observatory (Germany)
Philippe Balard, Lab. d'Astrophysique de Marseille (France)
Bart Dierickx, Caeleste (Belgium)
Arnaud Defernez, Caeleste (Belgium)
Benoit Dupont, Caeleste (Belgium)
Philippe Feautrier, Institut de Planétologie et d'Astrophysique (France)
Gert Finger, European Southern Observatory (Germany)
Martin Fryer, e2v technologies plc (United Kingdom)
Jean-Luc Gach, Lab. d'Astrophysique de Marseille (France)
Christian Guillaume, Observatoire de Haute Provence (France)
Norbert Hubin, European Southern Observatory (Germany)
Olaf Iwert, European Southern Observatory (Germany)
Paul Jerram, e2v technologies plc (United Kingdom)
Paul Jorden, e2v technologies plc (United Kingdom)
Andrew Pike, e2v technologies plc (United Kingdom)
Jerome Pratlong, e2v technologies plc (United Kingdom)
Javier Reyes, European Southern Observatory (Germany)
Eric Stadler, Institut de Planétologie et d'Astrophysique (France)
Andrew Walker, e2v technologies plc (United Kingdom)


Published in SPIE Proceedings Vol. 8453:
High Energy, Optical, and Infrared Detectors for Astronomy V
Andrew D. Holland; James W. Beletic, Editor(s)

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