Vol. 20, issue 11, article # 13

Kostylev A.Yu., Il'ina I.V., Cherezova T.Yu., Kudryashov A.V. Generation of vortex beams by controllable phase elements. // Atmospheric and oceanic optics. 2007. V. 20. No. 11. P. 940-944.
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A feasibility of generating laser beams with screw (or vortex) dislocations of the wave front with the aid of controllable phase optical elements having a continuous surface profile: bimorph adaptive mirror and electrically controllable liquid-crystal modulator, has been studied experimentally.