Control of metal ablation by temporally shaped femtosecond laser pulse

Temporally shaped femtosecond laser pulse control of two basic heat transportation processes in metals, i.e., electron-phonon coupling and electronic heat diffusion is investigated experimentally and theoretically. It is revealed that the transformation of single-pulse irradiation into double-pulse irradiation, or an adjustment of pulse-separation for double-pulse irradiation, in all case keeping the energy constant, can exert very different influence on electron-phonon coupling and electronic heat diffusion for different metals. This can lead to an unusual ablation/damage effect for nickel, i.e., an ablation/damage enhancement after double-pulse irradiation with respect to single-pulse irradiation, in comparison with the ablation/damage suppression for various other metals as widely reported. We conclude that control of heat transportation processes with tailored femtosecond pulses is suitable for robust manipulation of metal excitation and thus control of the initial steps of laser processing of metallic materials.

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