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15 July 2008 Off-axis point spread function reconstruction from a dual deformable mirror adaptive optics system
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Abstract
In AO applications, PSF reconstruction is used in calibrating image analysis techniques for astrometry, and in the deconvolution of images to enhance their contrast. The partial correction provided by the AO system is due to the finite sampling of the wavefront sensor, the DM (limited number of freedoms on the DM, i.e., the number of actuators) and the finite bandwidth of the control system. Furthermore, the correction provided by an AO system degrades across the field of view, depending on the angular separation between the guide star and the target object (anisoplanatism). In this paper, an end to end numerical model of an off-axis dual DM AO system has been implemented to accommodate for the anisoplanatic errors that degrade the performance of AO systems at greater angular distances from the guide star. An improved off-axis PSF reconstruction methodology has been developed and numerically evaluated for the dual DM (Woofer/Tweeter) off-axis AO architecture.
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O. Keskin, R. Conan, C. Bradley, and C. Blain "Off-axis point spread function reconstruction from a dual deformable mirror adaptive optics system", Proc. SPIE 7015, Adaptive Optics Systems, 701571 (15 July 2008); https://doi.org/10.1117/12.790026
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