This article is cited in 37 papers

OPTO-IT

Characteristics of sharp focusing of vortex Laguerre-Gaussian beams

D. A. Savelyev^ab, S. N. Khonina<sup>ab

a</sup> Image Processing Systems Institute, Russian Academy of Sciences, Samara, Russia
^b Samara State Aerospace University, Samara, Russia

Abstract: We investigate the intensity distribution of sharply focused Laguerre-Gaussian beams in relation to the uniform (linear and circular) polarization of the beam and the order of the vortex phase. It is shown that to the greatest extent the polarization state affects the longitudinal component of the electric vector of the light field. The greatest visual difference in the total intensity patterns for different polarization types is observed when using a first-order phase vortex. The use of a diffractive axicon improves focusing when compared with an aplanatic lens.

Keywords: sharp focusing, Gauss-Laguerre beams, optical vortices, axicon.

Received: 05.11.2015
Revised: 20.11.2015

DOI: 10.18287/0134-2452-2015-39-5-654-662