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Thermal response and optical absorptance of metals under femtosecond laser irradiation

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DOI: 10.4236/ns.2011.36068    5,393 Downloads   11,179 Views   Citations

ABSTRACT

A detailed study on correlation between residual thermal response of a sample and its optical absorptance change due to laser-induced sur-face structural modifications in multi-shot fem-tosecond laser irradiation is performed. Ex-periments reveal an overall enhancement for residual thermal coupling and absorptance in air. Surprisingly, residual thermal coupling in air shows a non-monotonic dependence on pulse number and reaches a minimum value after a certain number of pulses, while these behaviors are not seen in absorptance. In vacuum, how-ever, both suppression and enhancement are seen in residual energy coupling although ab-sorptance is always enhanced. From these ob-servations, it appears that air plasma plays a dominant role in thermal coupling at a relatively low number of applied pulses, while the forma-tion of craters plays a dominant role at a high number of pulses.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Vorobyev, A. and Guo, C. (2011) Thermal response and optical absorptance of metals under femtosecond laser irradiation. Natural Science, 3, 488-495. doi: 10.4236/ns.2011.36068.

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