1 February 2001 Self-defocusing of a laser beam in the process of deep-penetration welding
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Proceedings Volume 4348, Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering; (2001); doi: 10.1117/12.417621
Event: Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, 2000, St. Petersburg, Russian Federation
Abstract
In this contribution, we report on the results of analytical approaches and computer simulations of laser beam self- defocusing in laser induced plasma and gas oncoming flow above a cavity in deep penetration welding at atmospheric conditions. Nonlinear lens-like processes in oncoming jet flow ensure the feedback loop between the evaporation, penetration and laser beam intensity distribution in a workpiece. The processes are self-consistent with the conditions of the stable cavity existence. It is shown that the oncoming hot air jet flow above the plume brings the main contribution in the steady state and instability of the nonlinear beam broadening, which may reach 300%.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nikolay E. Galich, Valery A. Petrushchenkov, "Self-defocusing of a laser beam in the process of deep-penetration welding", Proc. SPIE 4348, Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (1 February 2001); doi: 10.1117/12.417621; https://doi.org/10.1117/12.417621
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KEYWORDS
Thermal optics

Absorption

Distortion

Metals

Refraction

Gaussian beams

Plasma

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