München 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

K: Fachverband Kurzzeit- und angewandte Laserphysik

K 9: Poster

K 9.4: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Durchgangshalle

Void formation in glasses by single ultra-short laser pulses — S. Lai^1,2,3, •M. Ehrhardt¹, P. Lorenz¹, B. Han³, and K Zimmer¹ — ¹Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, 04318 Leipzig, Germany — ²School of Science, Nanjing University of Science & Technology, Xiaolingwei 200, Nanjing 210094, China — ³Advanced Launching Co-innovation Center, Nanjing University of Science & Technology, Xiaolingwei 200, Nanjing 210094, China

The formation of voids developing bubbles near the surface of a soda-lime glass induced by single ultra-short laser pulses (λ = 775 nm, tpulse = 150 fs) will be shown. The void-forming semi-spheres with diameters up to 3 um. Cross sectioning cut by focused ion beam shows an ellipsoidal void inside the laser irradiated volume with an upper shell which has a thickness of approx. 100 nm. The voids are formed in a narrow fluence range between inside glass modification and ablation. The void forming mechanism will be discussed based on a nonlinear absorption process near the surface and subsequently thermalization of the hot electrons.