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Proceedings Paper

Comparison of different processes for separation of glass and crystals using ultrashort pulsed lasers
Author(s): M. Kumkar; L. Bauer; S. Russ; M. Wendel; J. Kleiner; D. Grossmann; K. Bergner; S. Nolte
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Paper Abstract

We investigate cutting of transparent materials using ultra short laser pulses with pulse durations in the sub to a few ps regime. All compared methods base on nonlinear absorption including ablation cutting and cleaving or selective etching supported by laser induced modification inside the bulk material. For most of the experiments samples of hardened glass (Corning Gorilla®) with thickness up to 700 μm were used, ablation cutting of sapphire is presented additionally. Absorption and modification inside the volume is analyzed in detail, aiming for tailored modifications. Besides optical microscopy a pump probe setup was used. We show results of time resolved absorption measurements of 6 ps pulses focused into the volume. We observe shielding due to the interaction region and accumulation effects influencing the modifications. First results on inscribing and cutting by using beam shaping indicate the importance of tailoring the shape and arrangement of the pulses temporally and spatially. The results presented for the different cutting methods supports an assessment of the individual potential and a selection of the applicable method based on the requirements.

Paper Details

Date Published: 7 March 2014
PDF: 16 pages
Proc. SPIE 8972, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV, 897214 (7 March 2014); doi: 10.1117/12.2044187
Show Author Affiliations
M. Kumkar, TRUMPF Laser- und Systemtechnik GmbH (Germany)
L. Bauer, TRUMPF Laser GmbH + Co. KG (Germany)
S. Russ, TRUMPF Laser GmbH + Co. KG (Germany)
M. Wendel, TRUMPF Laser- und Systemtechnik GmbH (Germany)
J. Kleiner, TRUMPF Laser- und Systemtechnik GmbH (Germany)
D. Grossmann, TRUMPF Laser- und Systemtechnik GmbH (Germany)
K. Bergner, Friedrich-Schiller-Univ. Jena (Germany)
S. Nolte, Friedrich-Schiller-Univ. Jena (Germany)


Published in SPIE Proceedings Vol. 8972:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV
Alexander Heisterkamp; Peter R. Herman; Michel Meunier; Stefan Nolte, Editor(s)

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