Stressed waveguides with tubular depressed-cladding inscribed in phosphate glasses by femtosecond hollow laser beams

Long, Xuewen; Bai, Jing; Zhao, Wei; Stoian, Razvan; Hui, Rongqing; Cheng, Guanghua

doi:10.1364/ol.37.003138

Cited by 20 publications

(11 citation statements)

References 16 publications

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“…In this paper we investigate theoretically and numerically a new type of beams, nonlinear Bessel vortices (NBVs) that started to be used recently for material processing [10,11] or investigations of propagation invariant beams [12] and are especially suitable for uniform energy deposition on a novel tubular geometry. These laser beams fulfill in particular the following conditions: (i) Their nonlinear propagation in transparent solids is quasi-stationary.…”

Section: Introductionmentioning

confidence: 99%

Filamentation with nonlinear Bessel vortices

Jukna¹,

Milián²,

Xie³

et al. 2014

Opt. Express

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We present a new type of ring-shaped filaments featured by stationary nonlinear high-order Bessel solutions to the laser beam propagation equation. Two different regimes are identified by direct numerical simulations of the nonlinear propagation of axicon focused Gaussian beams carrying helicity in a Kerr medium with multiphoton absorption: the stable nonlinear propagation regime corresponds to a slow beam reshaping into one of the stationary nonlinear high-order Bessel solutions, called nonlinear Bessel vortices. The region of existence of nonlinear Bessel vortices is found semi-analytically. The influence of the Kerr nonlinearity and nonlinear losses on the beam shape is presented. Direct numerical simulations highlight the role of attractors played by nonlinear Bessel vortices in the stable propagation regime. Large input powers or small cone angles lead to the unstable propagation regime where nonlinear Bessel vortices break up into an helical multiple filament pattern or a more irregular structure. Nonlinear Bessel vortices are shown to be sufficiently intense to generate a ring-shaped filamentary ionized channel in the medium which is foreseen as opening the way to novel applications in laser material processing of transparent dielectrics.

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Section: Introductionmentioning

confidence: 99%

Filamentation with nonlinear Bessel vortices

Jukna¹,

Milián²,

Xie³

et al. 2014

Opt. Express

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“…Bessel beams, among these engineered beam shapes, have attracted attention lately due to their interesting properties such as long depth-of-focus (propagation invariance), "self-healing", and the possession of orbital angular momentum [2]. For materials processing, zero-and high-orderBessel beams have been used to drill high-aspect-ratio nanochannels [3,4], produce structures inside silicon and glass [5][6][7][8][9], fabricate circular and ringshaped surface structures [10][11][12], scribe narrow grooves [13], and form three-dimensional patterns [14]. One can refer to Ref.…”

Section: Introductionmentioning

confidence: 99%

Materials processing with superposed Bessel beams

Trallero–Herrero

Lei

2016

Applied Surface Science

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We report experimental results of femtosecond laser processing on the surface of glass and metal thin film using superposed Bessel beams. These beams are generated by a combination of a spatial light modulator (SLM) and an axicon with >50% efficiency, and they possess the long depth-of-focus (propagation-invariant) property as found in ordinary Bessel beams. Through micromachining experiments using femtosecond laser pulses, we show that multiple craters can be fabricated on glass with single-shot exposure, and the 1+(-1) superposed beam can reduce collateral damage caused by the rings in zero-order Bessel beams in the scribing of metal thin film.

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“…In order to fabricate waveguide to confine light in these materials effectively, pair line structure consisting of two parallel tracks on each side of the unexposed central domain was successfully demonstrated to confine light [3]. In this paper we demonstrate the fast single-step writing of stressed waveguides with tubular depressed-refractive-index cladding in phosphate glasses by the use of vortex laser pulse [4].…”

Section: Introductionmentioning

confidence: 99%