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Simulation of the dynamics of heat accumulation during in-volume modification with ultrashort laser pulses

: Nippgen, S.; Gillner, A.; Smolenko, A.

Fulltext ()

Procedia CIRP 74 (2018), pp.705-708
ISSN: 2212-8271
International Conference on Photonic Technologies <10, 2018, Fürth>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer ILT ()

Working with ultrashort pulsed (USP) laser systems with high repetition rates ≥ 100 kHz, heat accumulation effects evolve and subsequently the absorption becomes linear. As a consequence, the process dynamics change significantly. Structuring glasses with those USP Lasers leads to melted lines that are used for waveguides, welding or selective laser-induced etching whose resulting qualities are strongly depending of the structuring results and given smoothness. We perform simulations during in-volume modification processes, by recalculating the absorption behavior in between the iteration steps of heat accumulation. The simulation results provide explanations for smoothness or non-smoothness of modifications comparable to experiments in glass.