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A new method for generating axially-symmetric and radially-polarized beams

2005; Institute of Physics; Volume: 38; Issue: 6 Linguagem: Inglês

10.1088/0022-3727/38/6/006

1361-6463

Chunhui Niu, Ben–Yuan Gu, Bi–Zhen Dong, Yan Zhang,

Optical measurement and interference techniques

A scheme for generating axially-symmetric and radially-polarized beams is proposed by using two diffractive phase elements (DPEs) made of birefringent materials. The design of these two DPEs is based on the general theory of phase-retrieval of optical system in combination with an iterative algorithm. The first DPE is used for demultiplexing two orthogonally linearly-polarized light beams to produce diffractive patterns, and the second DPE is used for compensating the phase difference to obtain the desired radially-polarized beam.