Noiseless imaging detector for adaptive optics with kHz frame rates
| Autor: | Anton S. Tremsin, Oswald H. W. Siegmund, Bettina Mikulec, Allan G Clark, Jason B. McPhate, John V. Vallerga |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Advancements in Adaptive Optics Advancements in Adaptive Optics pp. 1256-1267 |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.553017 |
| Popis: | A new hybrid optical detector is described that has many of the attributes desired for the next generation AO wavefront sensors. The detector consists of a proximity focused MCP read out by four multi-pixel application specific integrated circuit (ASIC) chips developed at CERN (âﾜMedipix2â) with individual pixels that amplify, discriminate and count input events. The detector has 512 x 512 pixels, zero readout noise (photon counting) and can be read out at 1 kHz frame rates. The Medipix2 readout chips can be electronically shuttered down to a temporal window of a few microseconds with an accuracy of 10 nanoseconds. When used in a Shack-Hartman style wavefront sensor, it should be able to centroid approximately 5000 spots using 7 x 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. A three year development effort for this detector technology has just been funded as part of the first Adaptive Optics Development Program managed by National Optical Astronomy Observatory. |
| Databáze: | OpenAIRE |
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