Method for mitigating 2.pi.N ambiguity in an adaptive optics control system
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United States of America Patent
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-
Jun 2, 1981
Grant Date -
N/A
app pub date -
Aug 30, 1979
filing date -
Aug 30, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of mitigating 2.pi.N phase ambiguity in an adaptive optics control system is disclosed wherein the radiation sensed by a detector within a feedback loop is passed through an aperture having a variable diameter. The turn-on of the adaptive optics control system is initiated with the aperture in an open position to transmit radiation from all actuator zones onto the detector resulting in a convergence free of the 2.pi.N phase ambiguity. The diameter of the aperture is then reduced slowly compared to the bandwidth of the control system to converge to a near diffraction limited output beam at the aperture.
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