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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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TL;DR: In this article, a reply to the comment [J. Opt. Am. Soc. A26, 2181 (2009)] on our paper that appeared in J. Opt., Am. A21, 1192 (2004) is given.
Abstract: This is a reply to the comment [J. Opt. Soc. Am. A26, 2181 (2009)] on our paper that appeared in J. Opt. Soc. Am. A21, 1192 (2004). In the paper the Helmholtz equation was used to introduce the expression of Eq. (2), which generates the fractional Bessel beam (FBB) when n is a fractional number. The paper, however, did not convey whether the FBB is a solution of the Helmholtz equation.
2 citations
05 Jun 2016
TL;DR: In this paper, femtosecond Bessel beam propagation in fused silica under ablation conditions was studied and the authors identify plasmon excitation and plasma channel field enhancement as the likely mechanism for increased absorption.
Abstract: FEMTO-ST Institute, UMR 6174 CNRS University of Bourgogne Franche-Comte, 15 B, rue des Montboucons, F-25030 Besancon, France 2Centre de Physique Theorique, CNRS, Ecole polytechnique Universite Paris-Saclay, F-91128 Palaiseau, France We image femtosecond Bessel beam propagation in fused silica under ablation conditions, and observe unexpectedly high absorption. We identify plasmon excitation and plasma channel field enhancement as the likely mechanism for this increased absorption.
2 citations
TL;DR: In this article, the rotational Raman response of air molecules was used to generate a bright and nearly collimated radiation in air pumped by an intense femtosecond Bessel beam.
Abstract: We demonstrate experimentally that bright and nearly collimated radiation can be efficiently generated in air pumped by an intense femtosecond Bessel beam. We show that this nonlinear conversion process is driven by the rotational Raman response of air molecules. Under optimum conditions, the conversion efficiency from the Bessel pump into the on-axis propagating beam exceeds 15% and is limited by the onset of intensity clamping and plasma refraction on the beam axis. Our experimental findings are in excellent agreement with numerical simulations based on the standard model for the ultrafast nonlinear response of air.
2 citations
TL;DR: Three-photon fluorescence imaging with an axially extended Bessel focus is demonstrated, using an axicon-based module which allowed for the generation of Bessel foci of varying numerical aperture and axial length.
Abstract: Volumetric imaging tools that are simple to adopt, flexible, and robust, are in high demand in the field of neuroscience, where the ability to image neurons and their networks with high spatiotemporal resolution is essential. Using an axially elongated focus approximating a Bessel beam, in combination with two-photon fluorescence microscopy, has proven successful at such an endeavor. Here we demonstrate three-photon fluorescence imaging with an axially extended Bessel focus. We use an axicon-based module which allowed for the generation of Bessel foci of varying numerical aperture and axial length, and apply this volumetric imaging tool to image mouse brain slices and for in vivo imaging of the mouse brain.
2 citations
01 Jan 1995
TL;DR: In this article, the authors reported the application of the Bessel beam to Doppler velocity estimation in medical imaging, tissue characterization, and nondestructive evaluation of materials.
Abstract: Limited-diffraction beams have a large depth of field and could be applied to medical imaging, tissue character- ization, and nondestructive evaluation of materials. This paper reports the application of limited-diffraction beams, specifically, the Bessel beam, to Doppler velocity estimation. The Bessel beam has the advantage that velocity estimation is less subject to the depth of moving objects and the Doppler spectrum has distinct shoulders that increase the accuracy of velocity (both magnitude and Doppler angle) estimation in noisy environments. The shoulders of the Doppler spectrum might also help in solving the inverse problem, e.g., estimation of the velocity distribution in vessels.
2 citations