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Surface charging and impulsive ion ejection during ultrashort pulsed laser ablation
R Stoian1, A Rosenfeld, D Ashkenasi
1Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born Strasse 2a, D-12489 Berlin, Germany.
Physical Review Letters
|February 28, 2002
Abstract:
We report time-resolved studies using femtosecond laser pulses, accompanied by model calculations, that illuminate the difference in the dynamics of ultrashort pulsed laser ablation of different materials. Dielectrics are strongly charged at the surface on the femtosecond time scale and undergo an impulsive Coulomb explosion. This is not seen from metals and semiconductors where the surface charge is effectively quenched.