Browsing by Author "Lutz, Norbert"
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- ItemMachining of silica glasses using excimer laser radiation(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1996) Hornberger, Helga; Weißmann, Rudolf; Lutz, NorbertVarious silica glasses were engraved deliberately by excimer laser radiation using wavelengths of 308 and 248 nm. The ablation of different samples was investigated by systematic Variation of the processing parameters. The ablation rates were determined using profilometry and gravimetric measurements by evaluating the processing quaUty and the morphology of the processed surfaces was considered. The phenomenon of ablation is explained as a non-linear interaction of the laser beam and the glass. The experimental results show that the ablation behaviour of silica glass depends on the wavelength and the intensity of the laser radiation, on the surface quahty and the degree of purity of the glass. Although high ablation rates were obtained, the suitability of excimer lasers for micromachining is restricted due to the rough surface morphology and poorly defmed edges.
- ItemSurface treatment of glass and ceramics using XeCI excimer laser radiation(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1993) Buerhop, Claudia; Lutz, Norbert; Weißmann, Rudolf; Tomandl, GerhardA XeCl excimer laser with uniform beam profile and 308 nm wavelength was used for ablation and surface modification of technical glasses and ceramics.The ablation behaviour and the resulting surface morphology of the different materials were measured in dependence upon the energy density and the number of pulses. In contradiction to ceramics, glasses show a higher ablation threshold and considerable higher ablation rates. Due to the short wavelength of the excimer laser, microstructuring of glass and ceramic surfaces is possible. Examples are presented, like marking of glasses, microline structuring of float glass, as well as positive and negative microstructuring of ceramics.