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  • Received: Sep. 5, 2006

    Accepted: --

    Posted: Jun. 27, 2007

    Published Online: Jun. 27, 2007

    The Author Email: Xiumin Gao (gaoxiumin@siom.ac.cn)

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    Xiumin Gao, Jian Wang. Focal evolution induced by combination of nonspiral and spiral phase plates[J]. Chinese Optics Letters, 2007, 5(5): 257

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Chinese Optics Letters, Vol. 5, Issue 5, 257 (2007)

Focal evolution induced by combination of nonspiral and spiral phase plates

Xiumin Gao*, and Jian Wang

Author Affiliations

  • Electronics and Information College, Hangzhou Dianzi University, Hangzhou 310018

Abstract

Focusing properties of Gaussian beam induced by nonspiral and spiral phase plates are investigated numerically. The nonspiral phase plate introduces phase singularity to the incident beam, and the spiral one adjusts the radial phase distribution. Intensity distributions in geometrical focal plane show that the parameters of phase plates can alter the intensity distributions considerably. And local dark focal spots may be obtained, the focal spot may evolve into a circle, a two-peak spot, or a curve line, which indicates that the combination of nonspiral and spiral phase plates can be used to form novel focal spots.

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