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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 1: Laser Systems and their Applications I
K 1.5: Talk
Monday, March 2, 2026, 12:45–13:00, HS 20
Utilizing Transient Effects for Ablating Glass Using Com- bined Picosecond and Nanosecond Laser Pulses — •Lasse Bienkowski1, 2, Liseth Y. Martinez Aponte1, Andreas A. Brand1, and Jan Nekarda1 — 1Fraunhofer Institute for Solar Energy Systems, Freiburg, Germany — 2Institut für Ionenphysik und Angewandte Physik Universität Innsbruck, Innsbruck, Austria
Ultrashort pulsed lasers are essential for various glass processing applications. Nanosecond (ns) laser pulses typically offer higher ablation rates, while picosecond (ps) pulses generally improve process quality. We explore a hybrid approach utilizing a double-pulse laser system capable of generating near-infrared pulse pairs with durations of 1 ps and 10 ns with a tunable delay. Our goal is to enhance ablation efficiency by using a leading ps-pulse to induce transient effects, enabling the absorption of subsequent ns-pulses.
We investigate the interaction by focusing the beam on fused silica and soda-lime glass and measuring the transmitted ns-pulse intensity. For leading ps-pulses, the transmission of the ns-pulses is reduced by up to 40 %. For leading ns-pulses, no reduction is observed, suggesting the presence of a transient effect triggered by the ps-pulse glass interaction.
In a single-shot ablation experiment, pulse pairs are focused on the glass samples. The resulting craters show an enhancement in ablation depth for leading ps-pulses, surpassing the single-pulse ablation depth. The effect persists for delays of >200 ns, depending on the material and envelope energy. This approach provides a promising route to faster laser-glass machining processes.
Keywords: double pulse; laser ablation; glass; ultra short pulse; nanosecond pulse