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Tubular filamentation for laser material processing.

Chen Xie¹, Vytautas Jukna², Carles Milián³

¹Département d'Optique P. M. Duffieux, Institut FEMTO-ST, UMR 6174 CNRS Université de Franche-Comté, F-25030 Besançon cedex, France.

Scientific Reports

|March 11, 2015

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This summary is machine-generated.

Researchers discovered a new femtosecond laser propagation regime for controlled internal structuring of dielectric materials. This method utilizes a stable light tube, overcoming nonlinear distortions for advanced material processing.

Area of Science:

Physics
Material Science
Optics

Background:

Controlled internal structuring of dielectric materials using femtosecond lasers is a significant challenge.
High-intensity femtosecond laser processing (>10^13 W/cm^2) is hindered by nonlinear spatial distortion.

Purpose of the Study:

To report a novel femtosecond laser pulse propagation regime for overcoming nonlinear spatial distortion.
To demonstrate a method for controlled internal structuring of dielectric materials at high intensities.

Main Methods:

Utilizing higher-order nondiffracting Bessel beams with optical vortex charge to seed the new regime.
Employing numerical simulations and a novel experimental approach for 3D fluence distribution imaging.
Analyzing propagation regime transitions in near and far fields.

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Main Results:

Discovery of a new propagation regime characterized by a hollow, uniform, and intense light tube.
Demonstrated propagation invariance of the light tube even at intensities causing dense plasma formation.
Experimental confirmation of numerical simulations through direct 3D imaging of fluence distribution.

Conclusions:

The new propagation regime enables controlled internal structuring of dielectrics, overcoming previous intensity limitations.
Plasma generation within the tubular geometry facilitates applications like single-shot index writing.
This research opens new avenues for material compression and atmospheric filamentation guiding.