Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9845364 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 7 Pages |
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 256Ã256 pixels, zero readout noise (photon counting), can be read out at 1Â 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 10Â 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 7Ã7 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
John Vallerga, Jason McPhate, Anton Tremsin, Oswald Siegmund, Bettina Mikulec, Allan Clark,