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DIRECTED
ENERGY
PROFESSIONAL
SOCIETY
Abstract: 24-Symp-019
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UNCLASSIFIED, PUBLIC RELEASE
Wavefront sensing and control in strong scintillations: a framework for iterative phase retrieval technique integration into atmospheric adaptive optics
In this presentation we provide a synopsis of basic wavefront sensing architectures and iterative phase retrieval algorithms that can be considered as candidates for closed-loop sensing of turbulence-induced phase aberrations and AO control in strong scintillations. It was shown that these sensors can be described in terms of the generic scintillation resistant wavefront sensor (SR-WFS) model introduced here. The SR-WFS model is further used for derivation of iterative phase and complex field (phase and magnitude) retrieval algorithms based on gradient descent optimization of a fidelity (error) metric and phase reciprocity principle. Performance of different SR-WFS types and phase retrieval algorithms are compared through wave-optics numerical modeling and simulation conducted for wide range of atmospheric turbulence conditions. We show that the special SR-WFS optical configuration referred to here as the scintillation-resistant advanced phase contrast (SAPCO) sensor can provide superior performance in terms of such metrics as phase retrieval convergence speed, SNR, compactness, and “simplicity” of hardware implementation. An atmospheric AO laser beam control system comprised of a SAPCO WFS, phase-conjugate type controller, and a high-resolution segmented (piston-type) wavefront corrector was introduced and analyzed.
UNCLASSIFIED, PUBLIC RELEASE
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