Abstract

Convergence is demonstrated from a 2π state to a minimum-error state in an active local-loop system. Correction occurs when the error signal is changed in sign by increasing the servo-detector aperture size to average the diffraction pattern spatially. A simple one-dimensional model shows that the error components in certain regions of the diffraction pattern are shifted in phase by −π from the axial components. Experimental measurements of system signals are presented.

© 1980 Optical Society of America

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