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Towards crack-free ablation cutting of thin glass sheets with picosecond pulsed lasers

: Sun, M.; Eppelt, U.; Hartmann, C.; Schulz, W.; Zhu, J.; Lin, Z.


Shao, J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.; Shanghai Institute of Optics and Fine Mechanics -SIOM-, Shanghai:
Pacific Rim Laser Damage 2017. Optical Materials for High Power Lasers : 21-24 May 2017, Shanghai, China
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10339)
ISBN: 978-1-5106-1123-8
ISBN: 978-1-5106-1124-5
Paper 103390O, 7 S.
Conference "Pacific Rim Laser Damage" <2017, Shanghai>
Fraunhofer ILT ()

We investigated the morphology and mechanism of laser-induced damage in the ablation cutting of thin glass sheets with picosecond laser. Two kinds of damage morphologies observed on the cross-section of the cut channel, are caused by high-density free-electrons and the temperature accumulation, respectively. Notches and micro-cracks can be observed on the top surface of the sample near the cut edge. The surface micro-cracks were related to high energy free-electrons and also the heat-affected zone. Heat-affected-zone and visible-cracks free conditions of glass cutting were achieved by controlling the repetition rate and spatial overlap of laser pulses.