A model of an annular flat-topped vortex beam based on multi-Gaussian superimposition is proposed. We experimentally produce this beam with a computer-generated hologram (CGH) displayed on a spatial light modulator (SLM). The power of the beam is concentrated on a single-ring structure and has an extremely strong radial intensity gradient. This beam facilitates various applications ranging from Sisyphus atom cooling to micro-particle trapping.
© 2011 Chinese Optics Letters
Jiannong Chen, Yongjiang Yu, and Feifei Wang, "Production of annular flat-topped vortex beams," Chin. Opt. Lett. 9, 011402- (2011)