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Proceedings Paper

Q-switched and mode-locked solid state laser for precision machining of transparent materials
Author(s): Andreas Lenk; Thomas Witke; Ulrich Franz
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Paper Abstract

A cw-pumped and mode-locked solid state laser emits an endless pulse sequence with pulse duration of about 50 - 100 ps and pulse intervals of about 10 ns. A pulse sequence of 300 ns is formed by the optional use of Q-switching. The largest pulse of this pulse sequence reaches a peak power of 2 MW. Power densities in the range of 1010 . . 1012 W/cm2 are available by suitable focusing. Such a laser system has been first used for precision machining. Because of the high power density non-linear effects allow the machining of transparent materials. The temporal and spatial formation of a laser induced plasma in the case of surface and sub-surface focusing has been investigated by a special high speed framing microscope. It consists of four electronic high speed cameras coupled with a long distance microscope via image splitter. The sub-surface focusing regime has been applied to anti- counterfeiting or decorative 2d and 3d-marking. The surface focusing regime (micro laser plasma sputtering) has been applied to pixel based micro marking of glass surfaces, creating of special scattering surfaces and non-slip finishing of glass flooring. Repetition rates up to 500 Hz guarantee an efficient production because of with processing time.

Paper Details

Date Published: 14 September 1998
PDF: 8 pages
Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); doi: 10.1117/12.321618
Show Author Affiliations
Andreas Lenk, Fraunhofer Institut fuer Werkstoff- und Strahltechnik Dresden (Germany)
Thomas Witke, Fraunhofer Institut fuer Werkstoff- und Strahltechnik Dresden (Germany)
Ulrich Franz, Fraunhofer Institut fuer Werkstoff- und Strahltechnik Dresden (Germany)

Published in SPIE Proceedings Vol. 3343:
High-Power Laser Ablation
Claude R. Phipps, Editor(s)

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