Topic
Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
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TL;DR: In this paper, a nonlinear frequency doubling of Bessel vortices in the conditions of new type synchronism (full conical phase-matching) is considered, based on that the spatial frequency cones of BLBs coincide with phase-matching cones of uniaxial crystals.
Abstract: Linear and nonlinear processes of transferring optical singularities from anisotropic crystals onto the wavefront
of Bessel light beams (BLBs) are investigated. The generation of high-order vortices at the propagation of BLBs along
the optical axes of crystals was studied. Particularly, a nonlinear frequency doubling of Bessel vortices in the conditions
of new type synchronism (full conical phase-matching) is considered. This scheme of three-wave interactions of BLBs
based on that the spatial frequency cones of BLBs coincide with phase-matching cones of uniaxial crystals. New type of
frequency doubling of Bessel vortices has been experimentally realized in uniaxial crystals.
4 citations
30 Nov 2017
TL;DR: In this article, the question of stability of vortex Bessel-Gaussian optical beams formed in turbulent atmosphere is theoretically considered and the detailed analysis of features of spatial structure of distribution of mean intensity of vortex bessel-gaussian optical beam in turbulent environment is analyzed.
Abstract: In this work the question of stability of the vortex Bessel-Gaussian optical beams formed in turbulent atmosphere is theoretically considered. The detailed analysis of features of spatial structure of distribution of mean intensity of vortex Bessel-Gaussian optical beams in turbulent atmosphere are analyzed. The quantitative criterion of possibility of formation of vortex Bessel-Gaussian optical beams in turbulent atmosphere is derived. It is shown that stability of the form of a vortex Bessel-Gaussian optical beam during propagation in turbulent atmosphere increases with increase of value of a topological charge of this optical beam.
4 citations
TL;DR: In this article , the authors present a set of design rules applicable to any type of Resonant Bessel-beam Launcher, regardless of its specific realization, showing a typical application of the proposed design workflow, along with a possible use of the launchers in a modern context.
Abstract: Resonant Bessel-beam launchers are low-cost, planar, miniaturized devices capable of focusing electromagnetic radiation in a very efficient way in various frequency ranges, with recent increasing interest for microwave and millimeter-wave applications (i.e., 3–300 GHz). In recent years, various kinds of launchers have appeared, with different feeding mechanisms (e.g., coaxial probes, resonant slots, or loop antennas), field polarization (radial, azimuthal, and longitudinal), and manufacturing technology (axicon lenses, radial waveguides, or diffraction gratings). In this paper, we review the various features of these launchers both from a general electromagnetic background and a more specific leaky-wave interpretation. The latter allows for deriving a useful set of design rules that we here show to be applicable to any type of launcher, regardless its specific realization. Practical examples are discussed, showing a typical application of the proposed design workflow, along with a possible use of the launchers in a modern context, such as that of wireless power transfer at 90 GHz.
4 citations
TL;DR: In this article , an enhanced frequency up-conversion based on four-wave mixing process assisted by a Bessel-Gaussian beam in a 5 S 1/2 − 5 P 3/2−5 D 5 2 − 6 P 3 2−6 P 3 /2 −5 S 1 /2 diamond-type atomic system of 85 Rb was presented.
Abstract: • The 420 nm coherent blue light (CBL) is generated as a result of four-wave mixing. • Conversion efficiency is enhanced about two times using the Bessel-Gaussian beam as a pump laser compared with a Gaussian beam. • Bessel-Gaussian beam due to the non-diffracting property overcomes the diffractive spread and retains higher intensity over a longer distance. • The CBL generated by the Bessel-Gaussian beam is immune to obstacles owing to the self-healing ability. We present an enhanced frequency up-conversion based on four-wave mixing process assisted by a Bessel-Gaussian beam in a 5 S 1/2 − 5 P 3/2 − 5 D 5/2 − 6 P 3/2 − 5 S 1/2 diamond-type atomic system of 85 Rb. The 420 nm coherent blue light (CBL) is generated and an enhanced conversion efficiency of approximately two times is realized using the Bessel-Gaussian beam as a pump laser compared with that of the Gaussian beam. The non-diffracting property of the Bessel-Gaussian beam, which overcomes the diffractive spread and retains a high intensity over a long distance, leads to the high conversion efficiency. The influence of different pump powers on the enhancement effect is investigated in detail. Furthermore, the CBL generated by the Bessel-Gaussian beam is immune to obstacles owing to the self-healing ability, which extends its application scenarios. The enhanced frequency up-conversion based on structured light is beneficial to the applications of the blue-violet light source, and holds tremendous promises for extending the existing nonlinear toolkit.
4 citations
02 Sep 2003
TL;DR: In this paper, the authors used both Gaussian and zeroth-order Bessel light beams to calculate the axial and transverse forces for guiding in both beams and showed that the Bessel beam allows for extended guiding distances compared to a Gaussian beam.
Abstract: Optical guiding of micron-sized particles is shown using both Gaussian and zeroth-order Bessel light beams. Axial and transverse forces for guiding in both beams are calculated. Experiments show that the Bessel beam allows for extended guiding distances compared to a Gaussian beam, at the expense of guiding velocity.
4 citations