Filamentation with nonlinear Bessel vortices.
Vytautas Jukna,C. Milián,Chen Xie,Tatiana Itina,John M. Dudley,François Courvoisier,Arnaud Couairon +6 more
TLDR
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.Abstract:
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.read more
Citations
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[INVITED] Ultrafast laser micro- and nano-processing with nondiffracting and curved beams: Invited paper for the section : Hot topics in Ultrafast Lasers
TL;DR: In this paper, non-diffracting and accelerating beam shaping that generates lines, tubes or curved segments of focused light on distances that exceed the Gaussian Rayleigh range by several orders of magnitude is discussed.
Journal Article
Application of Bessel Beams for Microfabrication of Dielectrics by Femtosecond Laser : Instrumentation, Measurement, and Fabrication Technology
TL;DR: In this article, a femtosecond microfabrication of transparent dielectrics using non-fracting Bessel beams instead of the conventionally used Gaussian beams is presented.
Journal ArticleDOI
Tubular filamentation for laser material processing
Chen Xie,Vytautas Jukna,Vytautas Jukna,C. Milián,R. Giust,Ismail Ouadghiri-Idrissi,Tatiana Itina,John M. Dudley,Arnaud Couairon,François Courvoisier +9 more
TL;DR: It is demonstrated how the generation of plasma in this tubular geometry can lead to applications in ultrafast laser material processing in terms of single shot index writing, and discussed how it opens important perspectives for material compression and filamentation guiding in atmosphere.
Journal ArticleDOI
Spatio‐temporal dynamics in nondiffractive Bessel ultrafast laser nanoscale volume structuring
Praveen Kumar Velpula,Manoj Kumar Bhuyan,François Courvoisier,Hao Zhang,Jean-Philippe Colombier,Razvan Stoian +5 more
TL;DR: In this article, the authors discuss the action of ultrashort Bessel laser beams in bulk fused silica and shed light on relaxation channels leading to one-dimensional structures with nanoscale sections and morphologies ranging from densified matter to nanosized cavities.
Journal ArticleDOI
Nonlinear Bessel vortex beams for applications
Cord L. Arnold,Cord L. Arnold,Selcuk Akturk,Selcuk Akturk,André Mysyrowicz,Vytautas Jukna,Vytautas Jukna,Arnaud Couairon,Tatiana Itina,Razvan Stoian,Chen Xie,John M. Dudley,François Courvoisier,Simone Bonanomi,Ottavia Jedrkiewicz,P. Di Trapani +15 more
TL;DR: In this paper, the authors investigate the nonlinear propagation of Bessel-Gauss vortices in transparent solids and show that their helicity provides an additional control parameter for single-shot precision micro-structuring of transparent surfaces.
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