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- Title
Focusing of Singular Beams.
- Authors
Volyar, A. V.; Fadeeva, T. A.
- Abstract
The process of focusing of an inhomogeneously polarized beam passed through a system consisting of a uniaxial crystal and a polarization filter is considered. It is shown that the action of this system is equivalent to the action of a phase transparency with a complex relief of the refractive index. In particular, if the angle between the axes of the quarter-wave plate and the polarizer is equal to 45°, this transparency has a helicoidal relief. Simultaneously, two singular beams with different curvatures of their wavefronts arise in the transparency. The action of the lens consists in formation of a combined singular beam having three focal waists. The boundary wave arising upon focusing is able not only to form a new spectrum of toroidal vortices, but also to straighten the focusing region, forming a fairly extended range with a weak divergence. © 2004 MAIK “Nauka / Interperiodica”.
- Subjects
POLARIZED beams (Nuclear physics); PARTICLE beams; POLARIZATION (Nuclear physics); HOLOGRAPHY; TRANSPARENCY (Optics); OPTICS
- Publication
Optics & Spectroscopy, 2004, Vol 96, Issue 1, p96
- ISSN
0030-400X
- Publication type
Article
- DOI
10.1134/1.1643993