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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
31 Mar 2020
TL;DR: In this paper, a femtosecond laser-induced breakdown spectrum generation and acquisition system based on space-time shaping is presented, where a Bessel light beam with a long focal depth is used for exciting material plasmas after being shrunk.
Abstract: The invention discloses a femtosecond laser-induced breakdown spectrum generation and acquisition system based on space-time shaping, and belongs to the technical field of femtosecond laser application. A Bessel light beam with a long focal depth is used for exciting material plasmas after being shrunk; under the condition that focusing is not carried out, plasma excitation with the same energy density is achieved at different height positions of a sample, the process of single-point independent focusing is omitted, possible human and machine errors in each time of focusing operation are avoided, and the stability, repeatability and collection efficiency of spectrum collection are guaranteed. The system can adjust parameters of the conical lens and the beam shrinking lens group to obtain Bessel regions with different focusing lengths, and a device suitable for samples with different height change ranges is designed according to individual requirements. When a femtosecond laser Bessel beam is adopted to excite plasmas on the surface of a rough sample, the combination of a half-wave plate and a Glan-Taylor prism in the system realizes the continuous linear adjustment of pulse energy,and realizes the sample detection and analysis under the nearly lossless condition.

1 citations

Patent
22 Jan 2019
TL;DR: In this paper, a method for producing stable nonlinear response and particle trapping was proposed, which consists of a light source, a beam expander, a spatial light modulator, a charge coupling element and a computing processing system.
Abstract: The invention discloses a method for producing dark and anti-dark non-diffraction beams. The method comprises the following steps: acquiring dynamically and continuously changed Bessel beams with different orders, and overlaying the obtained Bessel beams with different orders, producing a dark non-diffraction beam when the odd-order Bessel beam weight is greater than the even-odor Bessel beam weight; and producing the anti-dark non-diffraction beam when the odd-order Bessel beam weight is less than the even-odor Bessel beam weight. The invention further provides a device for producing dark andanti-dark non-diffraction beams, the device comprises a light source, a beam expander, a spatial light modulator, a charge coupling element and a computing processing system; the stable dark and anti-dark non-diffraction beams can be produced through above method, thereby laying the foundation for researching optical nonlinear response and particle trapping.

1 citations

Patent
29 Jan 2015
TL;DR: In this paper, the authors present a detection probe consisting of a light source which generates electromagnetic waves, a route change part which changes the route of the electromagnetic waves emitted from the light source, and a Bessel beam forming part which forms a Borschke beam in at least a part of an object using the electromagnetic signals where the route is changed by the route change parts.
Abstract: According to an embodiment of the present invention, a detection probe comprises: a light source which generates electromagnetic waves; a route change part which changes the route of the electromagnetic waves emitted from the light source; a Bessel beam forming part which forms a Bessel beam in at least a part of an object using the electromagnetic waves where the route is changed by the route change part; a detection part which detects an intensity of the electromagnetic waves from the object; and a housing which receives the light source, the route change part, the Bessel beam forming part, and the detection part therein As such, the present invention enables an effective scanning of the object using the Bessel beam

1 citations

Patent
25 Mar 1994
TL;DR: In this article, the authors proposed to restrain subsidiary maximum while keeping a small spot diameter and a large depth characteristic by superposing Bessel beams having subsidiary maximum in different positions in amplitude so as to interfere with each other.
Abstract: PURPOSE:To restrain subsidiary maximum while keeping a small spot diameter and a large depth characteristic by superposing Bessel beams having subsidiary maximum in different positions in amplitude so as to interfere with each other. CONSTITUTION:A laser beam L as a parallel light irradiates a concentric double ring opening 1, and the laser beam outgoing from the double ring opening 1 becomes two ring-like lights and pass through a lens 2, and they are superposed on the focal plane on the image side of the lens 2. The two ring-like lights become Bessel beams having mutually different diameters and distributions, and they interfere with each other to form a double Bessel beam due to being coherent. In this case, the parameter (6) is the ratio of diameters of two rings, and namely the parameter (f) is equal to the ratio of systems of two Bessel beams. This device is constituted so that the ratio (epsilon) of the two Bessel beams satisfy the relation; 0.3<=(epsilon)0.7.

1 citations

Proceedings ArticleDOI
01 Sep 2018
TL;DR: In this paper, an inherently integrated folded reflectarray fed by coaxial cable, achieving high-gain beam and first-order Bessel beam carrying orbital angular momentum (OAM), was presented.
Abstract: Folded reflectarray achieves high gain with low profiles and low aperture blockage, but also faces the challenges including integration with active circuits especially at millimeter-waves. To alleviate the integration issue, the substrate integrated waveguide is used as feeding source of folded reflectarray to replace traditional horn antenna. This paper presents an inherently integrated folded reflectarray fed by coaxial cable, achieving high-gain beam and first-order Bessel beam carrying orbital angular momentum (OAM). The simulation results demonstrate that the proposed folded reflectarrays successfully obtain Bessel beam inherently carrying OAM propagating non-diffractively.

1 citations


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