Laser shock processing of materials: study of laser-induced breakdown in water confinement regime

Laurent Berthe; Remy Fabbro; Patrice Peyre; L. Tollier; Eric Bartnicki

doi:10.1117/12.251184

23 September 1996 Laser shock processing of materials: study of laser-induced breakdown in water confinement regime

Laurent Berthe, Remy Fabbro, Patrice Peyre, L. Tollier, Eric Bartnicki

Proceedings Volume 2789, High-Power Lasers: Applications and Emerging Applications; (1996) https://doi.org/10.1117/12.251184
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

Laser shock processing (LSP) in water confinement regime was investigated for an incident 20-25 ns/40 J/(lambda) equals 1,064 micrometers pulsed laser beam. Experimental measurements of the shock wave temporal profiles induced by LSP have been performed with velocimetry interferometer system for any reflector. Above 10 GW/cm² the peak pressure is limited and the pulse pressure duration is reduced by parasitic plasma occurring in the confining water. The observation of the interaction zone with fast camera shows that the breakdown at the surface of the confining water is the only phenomena limiting the efficiency of the LSP. This plasma absorbs the incident laser energy and the power density reaching the target decreases. The duration of shock wave induced in the target is then shortened. This experiment explains the current limit of LSP in water confinement mode and opens new research field to understand the plasma effect at the surface of the confining water.

Citation Download Citation

Laurent Berthe, Remy Fabbro, Patrice Peyre, L. Tollier, and Eric Bartnicki "Laser shock processing of materials: study of laser-induced breakdown in water confinement regime", Proc. SPIE 2789, High-Power Lasers: Applications and Emerging Applications, (23 September 1996); https://doi.org/10.1117/12.251184

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