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Title

Optically sensitive Medipix2 detector for adaptive optics wavefront sensing

Authors
Vallerga, John
McPhate, Jason
Tremsin, Anton
Siegmund, Oswald
Published in Nuclear Instruments and Methods in Physics Research. A. 2005, vol. 546, no. 1-2, p. 263-269
Abstract A new hybrid optical detector is described that has many of the attributes desired for the next generation adaptive optics (AO) wavefront sensors. The detector consists of a proximity focused microchannel plate (MCP) read out by multi-pixel application specific integrated circuit (ASIC) chips developed at CERN (“Medipix2”) with individual pixels that amplify, discriminate and count input events. The detector has 256×256 pixels, zero readout noise (photon counting), can be read out at 1 kHz frame rates and is abutable on 3 sides. The Medipix2 readout chips can be electronically shuttered down to a temporal window of a few microseconds with an accuracy of 10 ns. When used in a Shack–Hartmann style wavefront sensor, a detector with 4 Medipix chips should be able to centroid approximately 5000 spots using 7×7 pixel sub-apertures resulting in very linear, off-null error correction terms. The quantum efficiency depends on the optical photocathode chosen for the bandpass of interest.
Keywords Adaptive opticsWavefront sensorsMCPMedipixGaAs photocathodes
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VALLERGA, John et al. Optically sensitive Medipix2 detector for adaptive optics wavefront sensing. In: Nuclear Instruments and Methods in Physics Research. A, 2005, vol. 546, n° 1-2, p. 263-269. https://archive-ouverte.unige.ch/unige:38085

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Deposited on : 2014-06-24

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