Abstract

We propose here a novel way to analyze Shack–Hartmann wavefront sensor images in order to retrieve more modes than the two centroid coordinates per sub-aperture. To do so, we use the linearized focal-plane technique (LIFT) phase retrieval method for each sub-aperture. We demonstrate that we can increase the number of modes sensed with the same computational burden per mode. For instance, we show the ability to control a $21\times 21$ actuator deformable mirror using a $10\times 10$ lenslet array.

© 2014 Optical Society of America

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