Modeling of high-precision wavefront sensing with new generation of CMT avalanche photodiode infrared detectors

Near-infrared wavefront sensing allows for the enhancement of sky coverage with adaptive optics. The recently developed HgCdTe avalanche photodiode arrays are promising due to their very low detector noise, but still present an imperfect cosmetic that may directly impact real-time wavefront measurem...

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Bibliographic Details
Published in:Applied optics (2004) 2015-12, Vol.54 (34), p.10163-10176
Main Authors: Gousset, Silvère, Petit, Cyril, Michau, Vincent, Fusco, Thierry, Robert, Clelia
Format: Article
Language:English
Subjects:
Adaptive optics
Arrays
Astrophysics
Avalanches
Cosmetics
Mathematical models
Mercury cadmium tellurides
Photodiodes
Physics
Wave fronts
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Summary:Near-infrared wavefront sensing allows for the enhancement of sky coverage with adaptive optics. The recently developed HgCdTe avalanche photodiode arrays are promising due to their very low detector noise, but still present an imperfect cosmetic that may directly impact real-time wavefront measurements for adaptive optics and thus degrade performance in astronomical applications. We propose here a model of a Shack-Hartmann wavefront measurement in the presence of residual fixed pattern noise and defective pixels. To adjust our models, a fine characterization of such an HgCdTe array, the RAPID sensor, is proposed. The impact of the cosmetic defects on the Shack-Hartmann measurement is assessed through numerical simulations. This study provides both a new insight on the applicability of cadmium mercury telluride (CMT) avalanche photodiodes detectors for astronomical applications and criteria to specify the cosmetic qualities of future arrays.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.54.010163