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unige:38085 
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Optically sensitive Medipix2 detector for adaptive optics wavefront sensing |
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| 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 optics — Wavefront sensors — MCP — Medipix — GaAs photocathodes | |
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Article (Published version) (383 Kb) - Limited access to UNIGE Other version: http://linkinghub.elsevier.com/retrieve/pii/S0168900205006686 |
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| Citation (ISO format) | 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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