31 January 2001 Correction of scintillation effects by multiconjugate adaptive optics
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Abstract
The atmospheric turbulence limits the performance of high resolution instruments. Adaptive Optics (AO) is a real time technique which compensates for the turbulent phase using a Deformable Mirror (DM) located in the instrument pupil. When a significant amount of turbulence is far away from the pupil, the AO performance is however limited by anisoplanatism and scintillation effects. For astronomical applications anisoplanatism effect is dominant, and can be corrected with several DMs conjugated with different turbulent layers ahead of the pupil. Recent studies have shown that such a concept of Multi-Conjugate Adaptive Optics (MCAO) can provide high resolution images in a large field of view. The goal of this study is to show that, in more severe turbulence conditions encountered in endoatmospheric applications, MCAO can also correct for scintillation effects, whereas classical AO is ineffective in this case. It appears that outside the weak perturbation turbulence domain, the perturbations of the nearest turbulent layers have to be corrected first in order to counteract the turbulence in the whole volume. This implies the use of relay optics for each turbulent layer in practical MCAO system designs. A simplified MCAO configuration is considered to study the number of DMs required to obtain a significant reduction of the scintillation.
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Jean-Baptiste Fouche, Jean-Marc Conan, Vincent Michau, Marc Sechaud, "Correction of scintillation effects by multiconjugate adaptive optics", Proc. SPIE 4167, Atmospheric Propagation, Adaptive Systems, and Laser Radar Technology for Remote Sensing, (31 January 2001); doi: 10.1117/12.413823; https://doi.org/10.1117/12.413823
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