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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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Journal ArticleDOI
TL;DR: In this paper, a space-time generalization of the known spatial (monochromatic) wave vortex beams carrying intrinsic orbital angular momentum (OAM) along the propagation direction is presented.
Abstract: We present a space-time generalization of the known spatial (monochromatic) wave vortex beams carrying intrinsic orbital angular momentum (OAM) along the propagation direction. Generic spatiotemporal vortex beams are polychromatic and can carry intrinsic OAM at an arbitrary angle to the mean momentum. Applying either (i) a transverse wave-vector shift or (ii) a Lorentz boost to a monochromatic Bessel beam, we construct a family of either (i) time-diffracting or (ii) nondiffracting spatiotemporal Bessel beams, which are exact solutions of the Klein-Gordon wave equations. The proposed spatiotemporal OAM states are able to describe either photon or electron vortex states (both relativistic and nonrelativistic) and have potential applications in particle collisions, optics of moving media, quantum communications, and astrophysics.

145 citations

Journal ArticleDOI
20 Feb 2015-Science
TL;DR: This work highlights that, even in free space, the invariance of the speed of light only applies to plane waves, and shows a reduction in the group velocity of photons in both a Bessel beam and photons in a focused Gaussian beam.
Abstract: That the speed of light in free space is constant is a cornerstone of modern physics. However, light beams have finite transverse size, which leads to a modification of their wave vectors resulting in a change to their phase and group velocities. We study the group velocity of single photons by measuring a change in their arrival time that results from changing the beam’s transverse spatial structure. Using time-correlated photon pairs, we show a reduction in the group velocity of photons in both a Bessel beam and photons in a focused Gaussian beam. In both cases, the delay is several micrometers over a propagation distance of ~1 meter. Our work highlights that, even in free space, the invariance of the speed of light only applies to plane waves.

142 citations

Journal ArticleDOI
TL;DR: The interference of surface plasmon waves excited by a radially polarized beam creates an evanescent Bessel beam with enhanced localized field and spot size beyond the diffraction limit.
Abstract: We report the experimental confirmation of the evanescent Bessel beam generation via surface plamson resonance excitation with a radially polarized beam. The interference of surface plasmon waves excited by a radially polarized beam creates an evanescent Bessel beam with enhanced localized field and spot size beyond the diffraction limit. The excitation of the surface plasmon is confirmed by the observation of a narrow dark ring at the back focal plane. Two-dimensional intensity distributions at different distances from the sample surface are mapped by a collection-mode near-field scanning optical microscope to verify the nondiffracting and decaying natures of the evanescent Bessel beam.

141 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used a Bessel beam for laser micro-fabrication of stainless steel and found that the threshold fluence to make a through hole increased with an increase in the sample thickness.
Abstract: A Bessel beam is suitable for laser micro-fabrication because it possesses both a micron-sized focal spot and a deep focal depth. As the influence of focusing aberrations is much smaller than that of a convex lens, the generation of a Bessel beam using an axicon is very practical. In the case of laser micro drilling of austenitic stainless steel with a Bessel beam, suitable processing conditions were investigated. The threshold fluence to make a through hole increased with an increase in the sample thickness. For samples with the same thickness, the threshold fluence increased with an increase in the crossing angle. A small crossing angle Bessel beam can drill a deep hole with a small threshold fluence. A through hole with a diameter smaller than 10 μm can be made on a stainless steel sheet 20 μm thick by using a Bessel beam with a large crossing angle. The taper of the hole drilled with the Bessel beam is smaller than that with the focused beam from the convex lens.

141 citations

Journal ArticleDOI
TL;DR: Experiments on ultrashort pulses that maintain their strong lateral and longitudinal localization in a bulk linear highly dispersive medium and can be applied in femtosecond laser optics are reported.
Abstract: We report experiments on ultrashort pulses that maintain their strong lateral and longitudinal localization in a bulk linear highly dispersive medium. The diameter of the central peak and the temporal width of the field autocorrelation function of the pulses were 20 µm and 210 fs, respectively, and the spatiotemporal structure was preserved in the course of 7-cm propagation in the sample. The pulses were obtained with a computer hologram designed for generating the Bessel beam and can be applied in femtosecond laser optics.

134 citations


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