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- Title
The minimum number belts of DOE for Bessel-Gauss beams to generate a strong longitudinally polarized beam.
- Authors
Fu, Jian; Wang, Ying; Chen, Peifeng
- Abstract
In this paper, we minimize the number of belts on the diffractive binary optical element (DOE) to generate a strong longitudinally polarized beam by focusing a radially polarized Bessel-Gaussian beam. Based on a combination of the three-belt DOE and a high-numerical aperture parabolic mirror focusing system, a needle of strong longitudinally polarized beam can be achieved. The transverse full width at half maximum of this longitudinally polarized beam is 0.40 λ and the longitudinal field power fraction reaches 85%. In alternative focusing elements, three belts are the minimum number of the DOE for Bessel-Gauss beams.
- Subjects
DIFFRACTIVE optical elements; POLARIZED beams (Nuclear physics); BESSEL beams; GAUSSIAN beams; PARABOLIC reflectors
- Publication
Applied Physics B: Lasers & Optics, 2017, Vol 123, Issue 12, p1
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-017-6852-2