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Title

Femtosecond laser induced density changes in GeO2 and SiO2 glasses: fictive temperature effect

Author(s)

Bressel, Lena;  de Ligny, Dominique;  Sonneville, Camille;  Martinez, Valerie;  Mizeikis, Vygantas;  Buividas, Ricardas;  Juodkazis, Saulius

Abstract

Density changes of GeO2 and SiO2 glasses subjected to irradiation by tightly focused femtosecond pulses are observed by Raman scattering. It is shown that densification caused by the void formation in GeO2 glass is very similar to the changes under hydrostatic pressure. In contrast, the experimental observations in SiO2 glass could be explained by pressure effect or by the fictive temperature anomaly, i. e., a resultant smaller specific volume of the glass (a denser phase) at a high thermal quenching rate. Density changes of GeO2 and SiO2 glasses are opposite upon close-to-equilibrium heating; this gives new insights into the mechanisms of densification under highly non-equilibrium conditions: fs-laser induced micro-explosions, heating and void formation. The pressure and temperature effects of glass modification by ultra-short laser pulses are discussed considering applications in optical memory, waveguiding, and formation of micro-optical elements.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics

Source

Optical Materials Express, Vol. 1, no. 4 (Aug 2011), pp. 605-613

Publication year

2011

Keyword(s)

Laser materials processing;  Laser-induced breakdown;  Glass and other amorphous materials;  Materials processing

Publisher

Optical Society of America

ISSN

2159-3930

Publisher URL

http://dx.doi.org/10.1364/OME.1.000605

Copyright

Copyright © 2011 Optical Society of America. The published version of the paper is reproduced here in accordance with the copyright policy of the publisher. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OME.1.000605. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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