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 eigenfields in the axicon-based Bessel-Gauss resonator by the transfer-matrix method: comment.

Abstract: Numerical calculations recently published [J. Opt. Soc. Am. A23, 912 (2006)] on the eigenmodes in axicon-based Bessel-Gauss resonators revealed significant inconsistencies regarding the modal patterns, the mode losses, the mode ordering by loss, and the intracavity field distributions. We show that the results are inaccurate mainly because (a) it was overlooked in the derivation of the matrix equations that light crosses twice through the axicon in a complete round-trip and (b) the numerical method used to evaluate the diffraction integral equations cannot resolve the eigenvalues and eigenfields for the given resonator configuration.

Antenna capable of generating Bessel beam in any orientation

Abstract: The invention provides an antenna capable of generating a Bessel beam in any orientation. The antenna comprises a bunching plane and a feed horn. The bunching plane having a dual-layer dielectric substrate structure with a bunching function consists of a lower printed circuit layer, a lower high-frequency dielectric substrate layer, an intermediate printed circuit layer, an upper high-frequency dielectric substrate layer, and an upper printed circuit layer that are laminated successively from bottom to top in a coaxial manner. The whole bunching plane is divided into bunching units arranged periodically by a mesh; and each bunching unit includes metal pasters of the upper printed circuit layer, the intermediate printed circuit layer, and the lower printed circuit layer and the upper high-frequency dielectric substrate layer and the lower high-frequency dielectric substrate layer, wherein the metal pasters have centers located on the same longitudinal axis. For non-diffracting beam generated by the antenna, scanning in all orientations within a range of having pitching angles from -65 degrees to 65 degrees and azimuth angles from 0 degree to 360 degrees is realized; and the depth of field of the beam is set freely. On the basis of the bunching plane technique, the two bunching plane only have thicknesses of 1 millimeter according to the common printed circuit board process, so that the weight of the lens is reduced by above 90% by being compared with the weight of the common lens.

Uniform-intensity axicon: A lens coded with a symmetrically cubic phase plate

Abstract: In this paper, an axicon, which is combined a symmetrically cubic phase plate with a perfect lens, is introduced. Based on stationary phase method and the numerical calculation, the diffraction field behind the axicon is investigated. It is shown that, by using this kind of axicons, we can obtain the uniform-intensity focal segment within the desired range.

New method of formation of high-order Bessel light beams using biaxial crystals

Abstract: A new method for obtaining high-order Bessel light beams has been developed and proved theoretically and experimentally. It is based on the phenomenon of transformation of circularly polarized light beam passing through biaxial crystal along its binormal. The method can provide conversion of input Gaussian beam into Bessel beam with an almost 100% efficiency. Besides this method can be used to convert high-intensity laser beams. The light field having the cross distribution in the form of spiral is obtained from the first order Bessel light beams. A possibility of formation of the zeroth and the first order Bessel light beam from Gaussian light beam in biaxial crystal without axicon is investigated theoretically.

Spatial-temporal dynamics of broadband terahertz Bessel beam propagation

Abstract: The unique properties of narrowband and broadband terahertz Bessel beams have led to a number of their applications in different fields, for example, for the depth of focusing and resolution enhancement in terahertz imaging. However, broadband terahertz Bessel beams can probably be also used for the diffraction minimization in the short-range broadband terahertz communications. For this purpose, the study of spatial-temporal dynamics of the broadband terahertz Bessel beams is needed. Here we present a simulation-based study of the propagating in non-dispersive medium broadband Bessel beams generated by a conical axicon lens. The algorithm based on scalar diffraction theory was used to obtain the spatial amplitude and phase distributions of the Bessel beam in the frequency range from 0.1 to 3 THz at the distances 10-200 mm from the axicon. Bessel beam field is studied for the different spectral components of the initial pulse. The simulation results show that for the given parameters of the axicon lens one can obtain the Gauss-Bessel beam generation in the spectral range from 0.1 to 3 THz. The length of non-diffraction propagation for a different spectral components was measured, and it was shown that for all spectral components of the initial pulse this length is about 130 mm.