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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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Patent
26 Mar 2019
TL;DR: In this article, a laser processing method for cutting a double-side frosted brittle material by using a Bessel beam is presented, which consists of adding light-transmitting liquid which is not easy to volatilize on the upper surface of an area to be cut of the frosted material, covering a light glass cover to eliminate bubbles between the light glass and the frosting brittle materials, and then placing the brittle materials on a processing platform.
Abstract: The invention belongs to the field of laser cutting, specifically relates to a laser processing method for cutting a frosted brittle material by using a Bessel beam. The method comprises the followingsteps of: adding light-transmitting liquid which is not easy to volatilize on the upper surface of an area to be cut of the frosted brittle materials; covering a light glass cover to eliminate bubbles between the light glass and the frosted brittle materials; and then placing the frosted brittle materials on a processing platform; adjusting an optical focusing system to enable the Bessel beam toform a focusing spot and a focal depth required for cutting the frosted brittle material after passing through a 4f system, and moving the Z axis of the axis where the optical focusing system is located to enable the focus of the Bessel beam to fall on the frosted brittle material; setting a cutting path, moving the X axis and Y axis of the processing platform to process the frosted brittle material. The laser processing method provided by the invention ensures the perfection of the Bessel beam focusing system by adding light-transmitting liquid which is not easy to volatilize on the area to be cut, realizes cutting the frosted brittle materials, so the method is suitable for double-side frosted brittle materials.

5 citations

Proceedings ArticleDOI
TL;DR: In this article, the concept of needle pulses was extended to other types of non-Gaussian fringe-free Bessel beams including significantly more complex ones, and a large variety of nonconventional nondiffracting beams of even highly asymmetrically partitions can be achieved with widely propagation invariant spectral and temporal properties.
Abstract: For an extended wavefront analysis, structured materials processing, optical information technologies, or superresolving microscopy with ultrashort pulses, more flexible and robust techniques of beam shaping are required. Non-Gaussian fringe-free Bessel beams ("needle beams") can be generated with programmable phase maps of phase-only displays. Such beams behave propagation invariant over relatively extended regions with respect to their characteristic spatio-temporal signatures. Here, we extend the concept of needle pulses towards other types of nondiffracting fields including significantly more complex ones. It is shown that also nondiffracting light slices, tubular beams or pixellated images can be composed from simple nondiffracting constituents of higher degree of symmetry. With arrangements of multiple small phase axicons programmed into liquid-crystal-on-silicon spatial light modulators, a large variety of non-conventional nondiffracting beams of even highly asymmetrically partitions can be achieved with widely propagation invariant spectral and temporal properties. Modified Shack-Hartmann sensors with integrated temporal sensitivity, advanced types of multichannel autocorrelators and adaptive materials processing with variable focal spots are proposed.

5 citations

Journal ArticleDOI
TL;DR: In this article, an experimental arrangement for detection of 2D and 3D refractograms by the laser refractography method is described, and digital registration of the experimental refractogram is carried out.
Abstract: Refraction of an astigmatic laser beam in a transition layer formed at the boundary between two liquids with different optical characteristics is studied theoretically and experimentally. An algorithm of calculating a ray trajectory in the transition layer of a stratified liquid is considered. The profile of the refractive index in the medium is modeled for three different distributions: linear, sinusoidal, and tangential. Computer modeling based on the above models allowed obtaining two- and three-dimensional images of the laser beam (refractograms) inside and outside of the medium. The influence of the beam parameters and the experimental layout on the shape of refractograms is studied, and optimal experimental conditions are determined. The experimental arrangement for detection of 2D and 3D refractograms by the laser refractography method is described. An experimental technique is developed, and digital registration of the experimental refractograms is carried out. Adaptation of special software for processing 2D refractograms allowed retrieving the refractive index profile in the transition layer of a liquid. Based on the tangential model of the diffusion layer in a saltstratified liquid, the values of the refractive index were obtained that allowed determining the salinity profile in the given layer.

5 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed an acoustic Bessel vortex (ABV) beam created by a quasi-three-dimensional reflected metasurface in free space based on phase modulation.
Abstract: Vortex beams have a typical characteristic of orbital angular momentum, which provides a new degree of freedom for information processing in remote communication and a form of non-contact manipulation for trapping particles. In acoustics, vortex beams are generally observed on the surface of a metamaterial structure or in a waveguide with a hard boundary owing to the characteristic of easy diffusion in free space. The realization of an acoustic vortex beam with a long-distance propagation in free space still remains a challenge. To overcome this, we report a type of acoustic Bessel vortex (ABV) beam created by a quasi-three-dimensional reflected metasurface in free space based on phase modulation. By using the Bessel and vortex phase profiles, we can realize an ABV beam with the high performances of both Bessel and vortex beams, and its effective propagation distance is larger than 9.2λ in free space. Beyond that, we discuss the bandwidth and topological charge of the ABV beam in detail, and the fractional bandwidth can reach about 0.28. The proposed ABV beam has the advantages of a high-performance vortex, long-distance propagation, and broad bandwidth, which provide a new pathway for designing multifunctional vortex devices with promising applications.

5 citations

Patent
15 Jan 2009
TL;DR: In this paper, a conical lens is used to make the pumping light generated by a pumping light source 2 into a Bessel beam and makes it incident on a solid laser medium 5, an aperture 7 and the host crystal 6 are integrally bonded together.
Abstract: PROBLEM TO BE SOLVED: To provide a pulsed laser oscillator which suppresses heat generation in a host crystal, can be miniaturized, has excellent thermal durability, and can obtain an output beam of high quality and high output. SOLUTION: The pulsed laser oscillator concerning this invention includes a conical lens 10 which makes the pumping light generated by a pumping light source 2 into a Bessel beam and makes it incident on a solid laser medium 5. The solid laser medium 5, an aperture 7 and the host crystal 6 are integrally bonded together, and direct bonding is carried out between the solid laser medium 5 and the aperture 7, and between the aperture 7 and the host crystal 6. COPYRIGHT: (C)2009,JPO&INPIT

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202373
2022149
2021113
2020126
2019134
2018140