Double-pulse femtosecond laser peening of aluminum alloy AA5038: Effect of inter-pulse delay on transient optical plume emission and final surface micro-hardness

Double-pulse ablativefemtosecond laser peening of the AA5038aluminum alloy surface in the phase explosion regime results in its enhancedmicrohardness, which monotonously decreases till the initial value versus inter-pulse delay, increasing on a sub-nanosecond timescale. Opticalemission spectroscopy of the double-pulse ablative plume reveals the same trend in the yield of the corresponding atomic and ion emission versus inter-pulse delay, enlightening the interaction of the secondfemtosecond laser pump pulse with the surface and the resulting plume.

Source: Applied Physics Letters - November 22, 2016 Category: Physics Authors: E. I. Ageev, V. Yu. Bychenkov, A. A. Ionin, S. I. Kudryashov, A. A. Petrov, A. A. Samokhvalov and V. P. Veiko Source Type: research