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Modifications and Color Markings in Glasses by UV Laser Radiation

Published online by Cambridge University Press:  01 February 2011

M. Talkenberg
Affiliation:
Lehrstuhl für Lasertechnik, Rheinisch-Westfälische Technische Hochschule Aachen, Aachen, Germany
G. Falkenberg
Affiliation:
Hamburger Synchrotronstrahlungslabor, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
M. Krauss
Affiliation:
Fraunhofer-Institut Silicatforschung, Würzburg, Germany
E. W. Kreutz
Affiliation:
Lehrstuhl für Lasertechnik, Rheinisch-Westfälische Technische Hochschule Aachen, Aachen, Germany Fraunhofer-Institut für Lasertechnik, Aachen, Germany
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Abstract

Rare earth-, transition metal- and metal doped soda lime-, BK7- and photosensitive lithium aluminosilicate glass are irradiated by pulsed UV laser radiation (wavelength λL = 355nm, pulse length tp = 10 to 80 ns) as a function of repetition rate, pulse energy and overlap between successive pulses. The solid state laser radiation is focused into the volume to fluences below the removal-threshold. Depending on the chemical composition, the laser parameters, and the processing variables the laser radiation is absorbed by optically- and photochemically active polyvalent ions with conversion of the optical energy into fluorescence stimulation and ionization as well as color center formation resulting in modifications and/or color markings in the VIS. The absorption and concentration changes of the polyvalent ions are probed by optical spectroscopy and transient absorption spectroscopy. The photochemical and -physical processes such as oxidation and reduction of polyvalent ions and/or color center generation underlying the modifications and color markings are discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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References

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