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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, an optical refracting system was designed to transform an input Gaussian laser beam into a diffraction-free Bessel beam, which was optimized for ease of fabrication.
Abstract: An optical refracting system has been designed to transform an input Gaussian laser beam into a diffraction-free Bessel beam. The optical systems characteristics are optimized for ease of fabrication.

29 citations

Journal ArticleDOI
TL;DR: Bessel beam microscopy (BBM) as discussed by the authors improves the resolution by placing a lens in series with an axicon in the optical path of a microscope, which improves the diffraction-limited resolution of the base microscope by one third.
Abstract: This Letter presents a technique for subdiffraction limit imaging termed Bessel beam microscopy (BBM). By placing a lens in series with an axicon in the optical path of a microscope, the diffraction-limited resolution of the base microscope is improved by one third. This improvement is demonstrated experimentally by resolving individual subdiffraction limit fluorescent beads in a close-pack arrangement. The behavior of the BBM system is explored using angular diffraction simulations, demonstrating the possibility of resolving features spaced as little as 110 nm apart when viewed with a 100×1.4 NA objective. Unique among super-resolution techniques, BBM acquires subdiffraction limit information in a single image with broadband unstructured illumination using only static geometric optics placed between the microscope and camera.

29 citations

Journal ArticleDOI
TL;DR: In this article, the characterizations of quasi-Bessel beam (QBB) formed by the ideal axicon and oblate-tip axicon are described, and simple analytical formulas can be used to predict the required laser parameters, including the laser pulse energy, the generated fluence distributions, and the beam diameters.
Abstract: A quasi-Bessel beam (QBB) is suitable for laser ablation because it possesses a micrometer-sized focal spot and long depth of focus simultaneously. In this paper, the characterizations of QBBs formed by the ideal axicon and oblate-tip axicon are described. Strong on-axis intensity oscillations occur due to interference between the QBB and the refracted beam by the oblate tip. Using the axicon for laser ablation was theoretically investigated. Simple analytical formulas can be used to predict the required laser parameters, including the laser pulse energy, the generated fluence distributions, and the beam diameters.

29 citations

Journal ArticleDOI
TL;DR: Theoretical and experimental results show that for this particular case, the J(0) Bessel beam is a limit when the number of points tends towards infinity and the associated complex degree of coherence is also a function of theNumber of points.
Abstract: An alternative method to generate J0 Bessel beams with controlled spatial partial coherence properties is introduced. Far field diffraction from a discrete number of source points on an annular region is calculated. The average for different diffracted fields produced at several rotation angles is numerically calculated and experimentally detected. Theoretical and experimental results show that for this particular case, the J0 Bessel beam is a limit when the number of points tends towards infinity and the associated complex degree of coherence is also a function of the number of points.

29 citations

Journal ArticleDOI
TL;DR: In this article, a deep imaging STED microscopy by using Gaussian beam for excitation and hollow Bessel beam for depletion (GB-STED) was proposed. And the proposed scheme showed the improved imaging depth up to ~155m in solid agarose sample, ~115m in PDMS and ~100m in phantom of gray matter in brain tissue with consistent super resolution, while the standard STED shown a significantly reduced lateral resolution at the same imaging depth.
Abstract: Stimulated emission depletion (STED) microscopy has become a powerful imaging and localized excitation method beating the diffraction barrier for improved lateral spatial resolution in cellular imaging, lithography, etc. Due to specimen-induced aberrations and scattering distortion, it has been a great challenge for STED to maintain consistent lateral resolution deeply inside the specimens. Here we report on a deep imaging STED microscopy by using Gaussian beam for excitation and hollow Bessel beam for depletion (GB-STED). The proposed scheme shows the improved imaging depth up to ~155{\mu}m in solid agarose sample, ~115{\mu}m in PDMS and ~100{\mu}m in phantom of gray matter in brain tissue with consistent super resolution, while the standard STED microscopy shown a significantly reduced lateral resolution at the same imaging depth. The results indicate the excellent imaging penetration capability of GB-STED, making it a promising tool for deep 3D imaging optical nanoscopy and laser fabrication.

29 citations


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