Light trajectory in Bessel–Gauss vortex beams

Abstract

We investigate the early stage of propagation of Bessel-Gauss vortex beams where a transition regime shows a progressive lateral expansion of the main intensity ring before reaching a diffraction-free regime. The eikonal equation is used to characterize the beam structure. The beam is featured by a family of hyperboloids with variable waists, generating a tapered tubular caustic. Our analytical results are in excellent agreement with numerical and experimental results. We show the transition regime can be well eliminated by using hollow input beams.

Two-photon polymerization of femtosecond high-order Bessel beams with aberration correction

“…Considering that the transitionally expanding ring lobe along propagation may occur more significantly for Bessel beams of certain parameters, as shown in Fig. 3 and discussed in our previous work [38,40] , the nondiffracting region should be carefully positioned to cross the whole photoresist layer to guarantee the fabrication of well-shaped microtubes, as shown in the inset of Fig. 2.…”

“…The second and third rows show the corresponding intensity profiles in experiments before and after the correction, respectively. After the transitionally expanding region along propagation [38,40] , the main lobe converges to a constant diameter (∼20 μm) in the nondiffracting regime, as shown in Fig. 3(g).…”

“…3 for comparison. The simulations are performed based on the angular spectrum method, as in our previous studies [38,40] . The second and third rows show the corresponding intensity profiles in experiments before and after the correction, respectively.…”

Manipulation of Microparticles By Bessel Light Beam

“…The intensity distribution in such beams is described by the Gaussian function. The maximum energy is concentrated on the optical axis and rapidly decreases to the borders in accordance with the Gaussian function [8]. The importance of Gaussian beams is determined by the following properties.…”

Submicron-quality cleaving of glass with elliptical ultrafast Bessel beams

“…In this context, the use of "nondiffracting" beams has opened up a number of opportunities in laser processing of transparent materials. Such nondiffracting beams are formed by an interference pattern that produces one or several high intensity spots that maintain their high intensity over an extended propagation distance [11][12][13] . These structures are remarkably resistant to nonlinear deformation, provided the interference angle and nonlinear losses are high enough.…”