4 November 2003 Hydrodynamical modeling of laser drilling with short and ultrashort pulses
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Proceedings Volume 5226, 12th International School on Quantum Electronics: Laser Physics and Applications; (2003) https://doi.org/10.1117/12.519517
Event: 12th International School on Quantum Electronics Laser Physics and Applications, 2002, Varna, Bulgaria
This contribution examines the basic concepts and results of two laser ablation models based on commercially available hydrodynamical codes. In both cases the different material phases are described continuously by a single numerical algorithm. The first approach uses a finite-element model for the simultaneous description of solid and melt. It is thereby particularly suited for the description of melt formation and ejection. The results indicate a slow acceleration of the melt during the laser pulse up to velocities of some 10m/s followed by a rather steady-going ejection which is finally cut off by the resolidification. Although it was possible to examine this expulsion process, the model showed considerable numerical stability problems for higher intensities and the ultrasonic vapor expansion cannot be included. To overcome these shortages another model is proposed which is based on an equation of state for the target material in combination with a special pressure-based solver. Besides the continuous description of the material states, it also includes a continuous treatment of the beam propagation and energy coupling by solving Maxwell's equations. Although the work on this model is still going on, some of its basic prospects and limitations can already be discussed.
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Andreas Ruf, Andreas Ruf, Detlef Breitling, Detlef Breitling, Peter Berger, Peter Berger, Friedrich Dausinger, Friedrich Dausinger, Helmut Huegel, Helmut Huegel, } "Hydrodynamical modeling of laser drilling with short and ultrashort pulses", Proc. SPIE 5226, 12th International School on Quantum Electronics: Laser Physics and Applications, (4 November 2003); doi: 10.1117/12.519517; https://doi.org/10.1117/12.519517

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