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26 June 2001 Laser ablation of polymers by ultrashort laser pulses (USLP): surface and bulk models
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Proceedings Volume 4423, Nonresonant Laser-Matter Interaction (NLMI-10); (2001)
Event: Nonresonant Laser-Matter Interaction (NLMI-10), 2000, St. Petersburg, Russian Federation
In the present communication we consider theoretically the effect of a single UV USLP and two successive UV USLPs on absorbing dielectrics near ablation threshold within the framework of a surface evaporation model and bulk photothermal models, which apply to polymer-like materials. In the case of pair-pulse ablation we investigate the dependence of the ablated depth on the delay time between USLPs. We show that this curve is formed in two possible regimes. It is shown that these regimes influence the shape of the delay curve. We argue that these regimes are the same for the bulk model as well. It means that it is difficult to distinguish between the models investigating only this curve. We consider possible pump-probe experiment where USLP with the fluence somewhat higher than the ablation threshold is employed as a pump, whereas probe radiation allows to determine the delay time between pump pulse and the state of ablation. We show that combining the experimental data on determination of delay curve in pair-pulse experiment and the above pump-probe single ablation allows determination of an appropriate model. The result of theoretical modeling are compared with the existing data on time-resolved UV USLP laser ablation experiments.
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Aleksey Yu. Malyshev and Nikita M. Bityurin "Laser ablation of polymers by ultrashort laser pulses (USLP): surface and bulk models", Proc. SPIE 4423, Nonresonant Laser-Matter Interaction (NLMI-10), (26 June 2001);

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