Topic
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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22 Jul 2006
TL;DR: In this article, a 2mm catheter was designed for optical coherence endoscopy with resolution of about 5============micron across a depth of focus of about 1.6mm.
Abstract: A biophotonics catheter was conceived with collimation optics, an axicon lens, and custom design imaging optics
yielding a 360 degree scan aimed at imaging within concave structures such as arteries and lung lobes. The large depth
of focus is necessary to image a long-depth-range sample with constant transverse resolution in optical coherence
tomography (OCT). There are two approaches to achieving constant invariant resolution in OCT: Dynamic focusing or
Bessel beam formation. This paper focuses on imaging with Bessel beams. The Bessel beams may be created with
axicon optics which can be used instead of a conventional focusing lens in the sample arm of the OCT interferometer.
In this paper we present the design of a 2mm catheter for optical coherence endoscopy with resolution of about 5
micron across a depth of focus of about 1.6mm. Importantly, we investigated the fabrication of a 800μm diameter
axicon lens and the associated lateral resolution obtained over a long depth range in our OCT system, compared to the
same OCT system using a conventional lens.
4 citations
TL;DR: In this article, a vacuum-laser-driven acceleration scheme using a laser Bessel beam is presented, which demonstrates diffraction-free propagation, which implies the possibility of extending the effective interaction distance for a laser-electron system.
Abstract: A vacuum-laser-driven acceleration scheme using a laser Bessel beam is presented. In contrast to the conventional Gaussian beam, the Bessel beam demonstrates diffraction-free propagation, which implies the possibility of extending the effective interaction distance for a laser-electron system. In this method, the Bessel beam is truncated by annular slits to realize a series of nonsuccessive dim regions along the path of laser propagation, where the amplitude of the laser field is reduced, making the electron slightly decelerate as it travels in the decelerating phase. We analyzed the propagation characteristics of the truncated Bessel beam with scalar diffraction theory, and then introduced this approach with careful investigation of a three-stage acceleration model.
4 citations
TL;DR: In this paper, the authors proposed an experimental scheme to achieve Anderson localization of phonons using an ion chain under irradiation of a laser Bessel beam, which is only relevant to the positions of the individual ions with respect to the standing wave of the beam, rather than the internal degrees of freedom of the ions.
Abstract: Trapped ions offer an excellent platform to investigate fascinating phenomena in quantum physics Here we propose an experimental scheme to achieve Anderson localization of phonons using an ion chain under irradiation of a laser Bessel beam The quasiperiodicity comes from the characteristic of the Bessel beam, which is only relevant to the positions of the individual ions with respect to the standing wave of the Bessel beam, rather than the internal degrees of freedom of the ions We demonstrate, by the inverse participation ratio, the delocalization-localization transition, which is sensitive to the strength and the phase of the Bessel beam laser Our model involving long-range phonon hopping could present richer phenomena than the Aubry-Andr\'e model including only nearest-neighbor coupling
4 citations
TL;DR: This paper presents experiments and detailed nonparaxial numerical simulations for a plane wave passing through these optical elements and shows that the lateral intensity distribution they generate differs from that of a Bessel beam for a significant part of their DOF.
Abstract: Axicons are known to produce a nearly Bessel beam transverse intensity distribution. It has been previously recognized that linear axicons and logarithmic axicons with a predefined distant depth of field (DOF) and no blocking present a development region characterized by an enlarged central spot size. In this paper, we aim to obtain a better insight on the formation of lateral light distribution in this development region. We also examine the spot size and transverse intensity distribution of the recently developed exponential axicon. We present experiments and detailed nonparaxial numerical simulations for a plane wave passing through these optical elements and show that the lateral intensity distribution they generate differs from that of a Bessel beam for a significant part of their DOF. This anomaly/irregularity in the formation of nondiffracting Bessel beams has to be taken into account in applications of these axicons, such as imaging or optical trapping.
4 citations
TL;DR: In this paper , the analytical solution of the superimposed chirped Bessel-Gaussian vortex beam (SCBGVB) in strongly nonlocal nonlinear medium (SNNM) was obtained by applying the Collins integral formula.
4 citations