Scientific article

Optically sensitive Medipix2 detector for adaptive optics wavefront sensing

Publication date2005

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.

  • Adaptive optics
  • Wavefront sensors
  • MCP
  • Medipix
  • GaAs photocathodes
Citation (ISO format)
VALLERGA, John et al. Optically sensitive Medipix2 detector for adaptive optics wavefront sensing. In: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 2005, vol. 546, n° 1-2, p. 263–269. doi: 10.1016/j.nima.2005.03.102
Main files (1)
Article (Published version)
ISSN of the journal0168-9002

Technical informations

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