Title

Self-focusing and beam attenuation in laser materials processing

Authors

Authors

P. Strombeck;A. Kar

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

J. Phys. D-Appl. Phys.

Keywords

FREE-SURFACE; CONVECTION; FLOW; POOL; Physics, Applied

Abstract

During laser materials processing, the melt pool can form a convex or concave surface depending on the processing conditions and surface tension of the liquid metal. The curved surface can act as a lens to refract the laser rays. Temperature distributions below the substrate's surface are calculated for various values of the attenuation coefficient and radii of curvature of the free surface of the melt pool. For convex spherical curvature and a large penetration depth of the laser beam, the subsurface temperatures are found to be extremely high, exceeding the surface temperature severalfold. This is because of self-focusing, that is further focusing of the laser beam, that causes high subsurface laser irradiance.

Journal Title

Journal of Physics D-Applied Physics

Volume

31

Issue/Number

12

Publication Date

1-1-1998

Document Type

Article

Language

English

First Page

1438

Last Page

1448

WOS Identifier

WOS:000074654800007

ISSN

0022-3727

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