期刊
OPTICS COMMUNICATIONS
卷 259, 期 2, 页码 449-454出版社
ELSEVIER
DOI: 10.1016/j.optcom.2005.09.022
关键词
optical vortices; helical phase; spatial filtering; spatial light modulator
类别
We report a method for generation of arbitrary shape and array of optical vortices by use of a superposition of coherent elementary vortices based on helical phase spatial filtering in spatial frequency domain. In this method, a helical phase spatial filter (HPSF) is placed in the spatial frequency plane of a 4-f imaging processing system. We demonstrated that the output field distribution represents the convolution between the input field and an elementary vortex field introduced by the HPSF, which results in a special shape or array of optical vortices determined by the degenerate properties of coherent elementary vortices and the distribution formats of the input field. (C) 2005 Elsevier B.V. All rights reserved.
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