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7 June 2006 On ultra-short laser pulse induced instabilities at the surface of non-metallic solids
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Proceedings Volume 6261, High-Power Laser Ablation VI; 626107 (2006)
Event: High-Power Laser Ablation 2006, 2006, Taos, NM, United States
The impact of intense femtosecond laser pulses on dielectric targets results in a non-equilibrium state of the surface. We consider the influence of this instability on ablation and surface relaxation phenomena. Important consequences of the laser-material coupling and energy dissipation are addressed such as transient and permanent modification of the surface. From experiments on ablation products kinetics, Coulomb explosion upon multiphoton surface ionization has been established as the initial mechanism for desorption of fast positive ions from dielectric surfaces. We refer to the role of surface defects responsible for ion yield enhancement and the nature of defects by detecting laser induced fluorescence. Additionally, observations point to a set-in of a thermal emission process at higher laser intensity. Investigating the dynamics of particle emission, we find ultra-short timescales for the coherence of electronic excitation and energy relaxation via transient phases, the latter related to the coupling strength of the various solids. The surface morphology after ablation is modified, with regular nano- and micro-structures of features originated from self-organization of surface instabilities.
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Florenta Costache, Sebastian Eckert, and Jürgen Reif "On ultra-short laser pulse induced instabilities at the surface of non-metallic solids", Proc. SPIE 6261, High-Power Laser Ablation VI, 626107 (7 June 2006);

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