Absorptivity modulation on wavy molten steel surfaces: The influence of laser wavelength and angle of incidence

Journal Article · Mon Oct 08 00:00:00 EDT 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4759126· OSTI ID:22080478

Kaplan, A F. H. ^[1]

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1. Department of Engineering Sciences and Mathematics, Lulea University of Technology, S-971 87 Lulea (Sweden)

The modulation of the angle-dependent Fresnel absorptivity across wavy molten steel surfaces during laser materials processing, like drilling, cutting, or welding, has been calculated. The absorptivity is strongly altered by the grazing angle of incidence of the laser beam on the processing front. Owing to its specific Brewster-peak characteristics, the 10.64 {mu}m wavelength CO{sub 2}-laser shows an opposite trend with respect to roughness and angle-of-incidence compared to lasers in the wavelength range of 532-1070 nm. Plateaus or rings of Brewster-peak absorptivity can lead to hot spots on a wavy surface, often in close proximity to cold spots caused by shadow domains.

• OSTI ID: 22080478
• Journal Information: Applied Physics Letters, Vol. 101, Issue 15; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ABSORPTIVITY
BEAMS
CARBON DIOXIDE LASERS
COMPUTERIZED SIMULATION
DRILLING
HOT SPOTS
INCIDENCE ANGLE
LASER MATERIALS
LIQUIDS
MODULATION
ROUGHNESS
STEELS
SURFACES
WAVELENGTHS