Damage in materials following ablation by ultrashort laser pulses: A molecular-dynamics study
- Departement de Physique et Regroupement Quebecois sur les Materiaux de Pointe (RQMP), Universite de Montreal, C.P. 6128, Succursale Centre-Ville, Montreal, Quebec, H3C 3J7 (Canada)
The formation of craters following femtosecond- and picosecond-pulse laser ablation in the thermal regime is studied using a generic two-dimensional numerical model based on molecular-dynamics simulations and the Lennard-Jones potential. Femtosecond pulses are found to produce very clean craters through a combination of etching of the walls and the formation of a very thin heat affected zone. Our simulations also indicate that dislocations are emitted continuously during all of the ablation process (i.e., for hundreds of ps). For picosecond pulses, we observe much thicker heat affected zones which result from melting and recrystallization following the absorption of the light. In this case also, continuous emission of dislocations--though fewer in number--takes place throughout the ablation process.
- OSTI ID:
- 21052763
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 18; Other Information: DOI: 10.1103/PhysRevB.76.184119; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABLATION
ABSORPTION
DAMAGE
DISLOCATIONS
FAILURES
HEAT AFFECTED ZONE
LASER RADIATION
LASERS
LENNARD-JONES POTENTIAL
MELTING
MOLECULAR DYNAMICS METHOD
PULSES
RECRYSTALLIZATION
SIMULATION
SOLIDS
TWO-DIMENSIONAL CALCULATIONS
VELOCITY
VISIBLE RADIATION