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Structural relaxation phenomena in silicate glasses modified by irradiation with femtosecond laser pulses

: Seuthe, Thomas; Mermillod-Blondin, Alexandre; Grehn, Moritz; Bonse, Jörn; Wondraczek, Lothar; Eberstein, Markus

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Scientific Reports 7 (2017), Art. 43815, 10 pp.
ISSN: 2045-2322
Deutsche Forschungsgemeinschaft DFG
EB 248/4 2
Laser-Glas Strukturierung
Deutsche Forschungsgemeinschaft DFG
RO 2074/8 2
Deutsche Forschungsgemeinschaft DFG
EI 110/30 2
Journal Article, Electronic Publication
Fraunhofer IKTS ()
Glass; femtosecond-laser; relaxation experiments

Structural relaxation phenomena in binary and multicomponent lithium silicate glasses were studied upon irradiation with femtosecond (fs) laser pulses (800 nm central wavelength, 130 fs pulse duration) and subsequent thermal annealing experiments. Depending on the annealing temperature, micro-Raman spectroscopy analyses evidenced different relaxation behaviours, associated to bridging and non bridging oxygen structures present in the glass network. The results indicate that the mobility of lithium ions is an important factor during the glass modification with fs-laser pulses. Quantitative phase contrast imaging (spatial light interference microscopy) revealed that these fs-laser induced structural modifications are closely related to local changes in the refractive index of the material. The results establish a promising strategy for tailoring fs-laser sensitivity of glasses through structural mobility.