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Umladen von Fremdionen beim Modifizieren von Glas mit UV-Laserstrahlung für das Farbmarkieren und Strukturieren

  • Talkenberg, Marc
Publication Date
Jan 01, 2005
Publikationsserver der RWTH Aachen University
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The laser induced changes of the optical and atomic properties in photosensitive lithium-aluminum-silicate glass and doped soda-lime glass are investigated with optical spectroscopy, time-resolved laser-absorption spectroscopy, x-ray fluorescence and x-ray absorption-near-edge spectroscopy (XANES) as well as electron spin resonance spectroscopy as a function of the laser parameter (e.g. wavelength, energy density and pulse duration), material parameter (e.g. concentration of ions) and processing parameter. Based on the measured changes of the absorption and concentration of polyvalent ions incorporated in the glass and on the grounds of the broad spectroscopic analyses it is concluded that the observed modifications, such as color markings, are due to photo-induced charge transfer between polyvalent ions. The results indicate that photo-induced oxidation and reduction as well as the generation and bleaching of defects are the dominant processes which lead to modifications in glass. The results are demonstrated in applications such as the generation of violet-, yellow- and red color markings in doped soda-lime glass produced with pulsed UV laser radiation. For example the color and intensity of the laser generated markings is controlled by variation of wavelength, energy density and concentration of polyvalent ions. Another application for photo-induced charge transfer demonstrated in this work is the color marking generated with pulsed UV laser radiation in combination with tempering and the structuring of photosensitive glass in combination with subsequent wet chemical etching. The observed changes in absorption and concentration in the optical spectra of cerium and silver doped photosensitive glass are due to photo-induced ionisation of the donator cerium. This result is confirmed by the measured absorption and concentration changes of trivalent cerium in the XANES spectra. The observed shift in the absorption edge and the changes of the oxidation number for monovalent silver in the XANES spectra are due to reduction of the acceptor silver. From the ESR spectra the generation and bleaching of defects and color centers is observed which decreases the efficiency of the color marking.The combination of doping and irradiating glass with UV laser radiation is considered to be an efficient procedure for e.g. color markings in glass. In fact the development of photonic manufacturing processes for applications in the glass-industry is still a major topic today and for the time being. In this work at least two manufacturing processes have been developed demonstrating that color markings and microstructures can be generated with laser radiation in glass.

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