Bessel beam

About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.

Analysis of angular harmonics-containing laser beams regeneration after an obstacle

Abstract: In this article the possibilities of different laser beams regeneration after an obstacle that can be the microparticle, trapped by the beam, are examined. The comparative analysis of regeneration properties of the Bessel beams, the Gauss-Laguerre modes and other beams, containing angular harmonics, is made. The forming of such beams has the maximum effectiveness with the help of phase diffractive optical elements. The experimental results of the Bessel beams regeneration, including those of none-zero order, are presented.

Transformation of a circularly obstructed Bessel beam by a fork-shaped grating

Abstract: We theoretically investigate the transformation of a nondiverging Bessel beam with phase singularity n, which is transversally obstructed by a circular aperture, in the process of its diffraction by a fork-shaped grating with integer topological charge (TC) p. Analytical expressions describing the diffracted wave field amplitude and intensity distributions are derived and analyzed. The diffracted beams are nondiverging in a defined propagation interval, which is calculated. The zeroth-diffraction-order beam has TC same as that of the incident beam. However, the TC of the higher- diffraction-order beams can be increased or reduced compared to that of the incident beam, or it can be equal to zero. Also, the expressions for the radii of the central bright spot (if the beam is without TC) and of the vortex core (if the beam is with phase singularity) are derived.

Optical systems based on conical elements for forming extended plasma channels in the atmosphere

Abstract: This paper discusses a nontraditional optical shaping system for generating extended plasma channels in the atmosphere, using pulsed CO2 lasers and consisting of a convex mirror axicon with a rectilinear generatrix and a retranslating layout composed of two spherical optical elements. The system makes it possible to form the waist of a Bessel beam at a significant distance from the axicon. An analytical model is proposed for designing the developed optical system.

Millimeter wave imaging with Bessel beams

Abstract: In this paper, we generate the zero-order Bessel beam at W band using a diagonal horn, a convex lens, and an axicon. The generated Bessel beam has smaller beam spot size than the Gaussian beam. Some imaging experiments with the generated zero-order Bessel beam are done. The results show that the millimeter wave imaging with the zero-order Bessel beam can get an imaging resolution of about 1mm to 2mm.

Finite Element Modelling of Pulsed Bessel Beam and X-Waves Using Diffpack

Abstract: This article reports some preliminary results in the development of a finite element simulator for ultrasonic fields using the numerical programming library Diffpack. In our present work, we are combining the study of linearly–based limited diffraction beams (Bessel beams and X–Waves) with the development of a finite element package for analysis of linear and nonlinear media in order to compare how such waves behave in the two cases. The medium may be either homogeneous or inhomogeneous. The main content of this paper is on the linear model, but we also include some recent developments on propagation in nonlinear medium.