Oscillatory regime of metallic plate breakdown under laser beam

Alexander F. Banishev; Vladimir S. Golubev; M. M. Novikov; Olga D. Khramova

doi:10.1117/12.171651

1 April 1994 Oscillatory regime of metallic plate breakdown under laser beam

Alexander F. Banishev, Vladimir S. Golubev, M. M. Novikov, Olga D. Khramova

Proceedings Volume 2257, Russia National Conference: Industrial Lasers and Laser Material Processing; (1994) https://doi.org/10.1117/12.171651
Event: Industrial Lasers and Laser Material Processing: Russian National Conference, 1993, Shatura, Moscow Region, Russian Federation

Abstract

Dynamics of keyhole formation in metal plates of Mo, W, Ni, stainless steel have been studied under the solid-state laser pulse effect ((lambda) equals 1.06 micrometers ). Velocities of the keyhole bottom motion have been determined for these metals in the (0.5 (DOT) 10⁵ - 10⁶) W/cm² range of irradiated power densities. A pulse regime of plate breakdown has been found out. Small-dimensional structures with d is congruent to 1 micrometers period were found on the keyhole walls, which, in our opinion, can contribute significantly to laser beam absorption. A new form of periodic structure has been revealed, being a helix-shaped modulation of the keyhole walls and bottom relief. Temperature variation were discovered in the keyhole, related to capillary waves propagation in the melt layer.

Citation Download Citation

Alexander F. Banishev, Vladimir S. Golubev, M. M. Novikov, and Olga D. Khramova "Oscillatory regime of metallic plate breakdown under laser beam", Proc. SPIE 2257, Russia National Conference: Industrial Lasers and Laser Material Processing, (1 April 1994); https://doi.org/10.1117/12.171651

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