Self-focusing and beam attenuation in laser materials processing
Abbreviated Journal Title
J. Phys. D-Appl. Phys.
FREE-SURFACE; CONVECTION; FLOW; POOL; Physics, Applied
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 of Physics D-Applied Physics
"Self-focusing and beam attenuation in laser materials processing" (1998). Faculty Bibliography 1990s. 2463.