Femtosecond laser-induced modification of potassium-magnesium silicate glasses: An analysis of structural changes by near edge x-ray absorption spectroscopy

• Published in: Applied physics letters Vol. 100; no. 22; pp. 224101 - 224101-3
• Main Authors: Seuthe, T., Höfner, M., Reinhardt, F., Tsai, W. J., Bonse, J., Eberstein, M., Eichler, H. J., Grehn, M.
• Format: Journal Article
• Language: English
• Published: United States American Institute of Physics 28-05-2012
• Subjects: ABSORPTION SPECTROSCOPY; BESSY STORAGE RING; BOND LENGTHS; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRONS; EV RANGE; GLASS; MAGNESIUM; MAGNESIUM IONS; MAGNESIUM SILICATES; MATERIALS SCIENCE; OXYGEN IONS; PHYSICAL RADIATION EFFECTS; POTASSIUM; PULSED IRRADIATION; X RADIATION; X-RAY SPECTROSCOPY
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4723718

The effects of femtosecond laser pulse irradiation on the glass structure of alkaline silicate glasses were investigated by x-ray absorption near edge structure spectroscopy using the beamline of the Physikalisch-Technische Bundesanstalt at the electron synchrotron BESSY II in Berlin (Germany) by analyzing the magnesium K-edge absorption peak for different laser fluences. The application of fluences above the material modification threshold (2.1J/cm
2
) leads to a characteristic shift of ∼1.0eV in the K-edge revealing a reduced (∼3%) mean magnesium bond length to the ligated oxygen ions (Mg-O) along with a reduced average coordination number of the Mg ions.