Abstract

The phase correction of a vortex laser beam is undertaken in the closed-loop adaptive system including a Hartmann–Shack wavefront sensor with singular reconstruction technique and a bimorph piezoceramic mirror. After correction the vortex doughnutlike beam is focused into a beam with bright axial spot that considerably increases the Strehl ratio and optical system resolution. Since the phase break cannot be exactly reproduced on the flexible mirror surface, off-axis vortices appear in the far field at the beam periphery.

© 2009 Optical Society of America

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