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25 August 2009 Laser beam shaping: donut mode formation by interference
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Laser beam shaping is an active discipline in optics owing to its importance to both illumination and detection processes. The formation of single or multiples optical vortices in a laser beam has taken on recent interest in areas ranging from electron and atom optics to astronomy. An optical vortex is characterized as a point node of destructive interference around which the phase varies by an integer multiple of 2 times π. Here we describe our efforts to create localized vortex cores using only the interference of several Gaussian profile laser beams, a method that may be particularly suited to the application of vortex modes to intense femtosecond laser pulses.
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Liubov Kreminska, Carl Corder, Vanessa Engquist, Oleksiy Golovin, Peter Hansen, Herman Batelaan, Anatoliy Khizhnyak, and Grover A. Swartzlander Jr. "Laser beam shaping: donut mode formation by interference", Proc. SPIE 7430, Laser Beam Shaping X, 743018 (25 August 2009); doi: 10.1117/12.836582;

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