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Closed-Loop Adaptive Optics Control in Strong Atmospheric Turbulence
Paperback
Technology & EngineeringPhysics
ISBN13: 9781025136172
Publisher: Hutson Street Press
Published: May 22 2025
Pages: 152
Weight: 0.49
Height: 0.33 Width: 6.14 Depth: 9.21
Language: English
A self-referencing interferometer based closed-loop adaptive optics controller is developed which is designed to operate effectively under strong turbulence conditions. The aberrated optical field is modeled stochastically and then estimates of the state of the system are developed using a steady-state, fixed-gain Kalmanfilter. The phase of the optical field is considered the state of the system which is wrapped in a limited range of (-; ]. This phase is unwrapped through the use of a least-squares reconstructor which has been modified to work effectively in the presence of branch points associated with strong turbulence. The conjugate of the optical phase is then applied to the system's deformable mirror in order to correct for the e ects of atmospheric turbulence on the optical field. The advances developed in this research are in the application of a steady-state, fixed-gain Kalmanfilter to the input of an adaptive optic system, unwrapping the optical phases after the field estimation, and improving the phase unwrapping by varying the domain of the rotational phase component present in strong turbulence. The system developed in this research is shown in computer simulation to be improved over current designs by comparing performance plotsof system Strehl ratios for systems utilizing the different designs.
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