Q-switched and mode-locked solid state laser for precision machining of transparent materials

Andreas Lenk; Thomas Witke; Ulrich Franz

doi:10.1117/12.321618

14 September 1998 Q-switched and mode-locked solid state laser for precision machining of transparent materials

Andreas Lenk, Thomas Witke, Ulrich Franz

Proceedings Volume 3343, High-Power Laser Ablation; (1998) https://doi.org/10.1117/12.321618
Event: High-Power Laser Ablation, 1998, Santa Fe, NM, United States

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.

Citation Download Citation

Andreas Lenk, Thomas Witke, and Ulrich Franz "Q-switched and mode-locked solid state laser for precision machining of transparent materials", Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); https://doi.org/10.1117/12.321618

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