Title

Self-focusing and beam attenuation in laser materials processing

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.

Publication Date

6-21-1998

Publication Title

Journal of Physics D: Applied Physics

Volume

31

Issue

12

Number of Pages

1438-1448

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/0022-3727/31/12/007

Socpus ID

0032098667 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0032098667

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