1 April 1994 Oscillatory regime of metallic plate breakdown under laser beam
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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.
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Alexander F. Banishev, Alexander F. Banishev, Vladimir S. Golubev, Vladimir S. Golubev, M. M. Novikov, M. M. Novikov, Olga D. Khramova, 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); doi: 10.1117/12.171651; https://doi.org/10.1117/12.171651
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