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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 13,
  • Issue 4,
  • pp. 041101-041101
  • (2015)

Hybrid approach used for extended image-based wavefront sensor-less adaptive optics

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Abstract

The stochastic parallel gradient descent (SPGD) algorithm is widely used in wavefront sensor-less adaptive optics (WSAO) systems. However, the convergence is relatively slow. Modal-based algorithms usually provide much faster convergence than SPGD; however, the limited actuator stroke of the deformable mirror (DM) often prohibits the sensing of higher-order modes or renders a closed-loop correction inapplicable. Based on a comparative analysis of SPGD and the DM-modal-based algorithm, a hybrid approach involving both algorithms is proposed for extended image-based WSAO, and is demonstrated in this experiment. The hybrid approach can achieve similar correction results to pure SPGD, but with a dramatically decreased iteration number.

© 2015 Chinese Laser Press

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