Topic
Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
Papers published on a yearly basis
Papers
More filters
27 Nov 2012
TL;DR: In this paper, the coherence properties of vortex Bessel optical beams in the turbulent atmosphere were investigated and it was shown that at low levels of fluctuations, the degree of coherence depends on the value of a topological charge of a beam.
Abstract: The coherent properties of the higher modes of the Bessel optical beams formed in the turbulent atmosphere are studied.
The degree of coherence of vortex Bessel optical beams depending on parameters of a beam and characteristics of the
turbulent atmosphere are considered. It is shown that, at low levels of fluctuations in the turbulent atmosphere, the
degree of coherence of a vortex Bessel optical beam essentially depends on value of a topological charge of a beam. At
high levels of fluctuations in the turbulent atmosphere, the degree of coherence of a vortex Bessel beam becomes closer
to the similar characteristic of a spherical wave at much higher levels of fluctuations, than it was observed for a
fundamental Bessel beam.
18 citations
TL;DR: In this paper, a phase modulation method for generating an elliptic optical vortex with an arbitrary controllable rotation angle is proposed, which can be recognized as a controllability degree of freedom.
Abstract: We propose a highly efficient phase modulation method for generating an elliptic optical vortex with an arbitrary controllable rotation angle, that can be recognized as a controllable degree of freedom. A transformation matrix and rotation matrix were used to realize the modulation of the light field. We numerically and experimentally demonstrate the control capability of Bessel beam and higher-order Laguerre–Gauss vortex modes. The rotation angle β, elliptic degree e and multiplexing elliptic optical vortices could be freely modulated by using the proposed method. This work is important for the progress of programmable optical tweezers, as well as for automated optical transport operations which are of interest in colloidal physics and biophysics. It can also be applied in high-dimensional and multiphoton quantum experiments.
18 citations
TL;DR: In this article, a fiber-based Bessel optical trap for the simultaneous trapping of both high-refractive-index particle and a lowrefractive index particle is presented. But the method is limited to single-mode fiber.
18 citations
Patent•
31 May 2001TL;DR: In this paper, diffractive optical elements are used to create a Bessel-Gaussian scanning beam, which comprises a coherent combination of a Gaussian beam and Bessel beam.
Abstract: A beam generator, or beam shaping system, for example for use in an optical scanner, creates a non-Gaussian beam which provides improved indicia-reading characteristics. In one embodiment, diffractive optical elements are used to create a Bessel-Gaussian scanning beam, which comprises a coherent combination of a Gaussian beam and a Bessel beam.
18 citations
Patent•
02 Jun 1994
TL;DR: In this paper, the authors presented a method to obtain an optical system and an optical apparatus executing optical scan in a short time by irradiating a sample with a laser light emitted from a laser 1 and passing through a plane mirror 3, a beam expander 4, an axicon pair 6, abeam reducer 9, a dichroic mirror 11a, an X-Y scanner 12, a focus lens 13 and an objective lens 14.
Abstract: PURPOSE:To obtain an optical system and an optical apparatus executing optical scan in a short time. CONSTITUTION:A sample 15 is irradiated with a laser light 2 emitted from a laser 1 and passed through a plane mirror 3, a beam expander 4, an axicon pair 6, a beam reducer 9, a dichroic mirror 11a, an X-Y scanner 12, a focus lens 13 and an objective lens 14. A fluorescence 16 emitted from the rear side of the sample 15 is detected by a PMT 19a through a condenser lens 17 and a barrier filter 18. A fluorescence 16a emitted from the surface side of the sample 15 travels on the optical path of the laser light 2 reversely and detected by a PMT 30a through the dichroic mirror 11a. The axicon pair 6 comprises two axicon prisms 7a, 7b and the laser light passes through the axicon pair 6 to produce a cylindrical luminous flux 8 which then passes through the objective lens 14 to produce a Bessel beam.
18 citations