München 2019 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 9: Poster
K 9.4: Poster
Thursday, March 21, 2019, 16:30–18:30, Durchgangshalle
Void formation in glasses by single ultra-short laser pulses — S. Lai1,2,3, •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.