Volume 114, Number 2, April 2016
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||18 May 2016|
Bond-breaking mechanism of vitreous silica densification by IR femtosecond laser pulses
1 University of Missouri, Department of Mechanical and Aerospace Engineering - E 2412 Lafferre Hall, Columbia, MO 65211, USA
2 Institut Lumière Matière, UMR 5306 CNRS - Université Lyon 1, Université de Lyon F-69622 Villeurbanne Cedex, France
3 Joint Institute for High Temperatures, RAS - 13 Bld. 2 Izhorskaya str., Moscow 125412, Russia
Received: 14 March 2016
Accepted: 29 April 2016
The densification of the vitreous silica (v-SiO2) due to laser irradiation appears reasonable to cause the change in refractive index. In this letter, the v-SiO2 densification under IR femtosecond laser irradiation is studied within molecular-dynamics simulation. The single- and multi-pulse interactions are explored numerically with an account of the bond-breaking mechanism. By analyzing the network at nanoscale, the nature of v-SiO2 densification is assigned to the reduction of major ring fractions of six- and seven-membered rings to minor fractions of three- and four-membered rings (related to D2 and D1 Raman signatures, respectively). The athermal behavior of v-SiO2 densification is disclosed at different degrees of ionization for both the single- and multi-pulse cases at sub-threshold regimes. The good agreement between calculated and measured D2 defect line and Si-O-Si angle changes argues in favor of the found mechanism.
PACS: 61.80.Ba – Ultraviolet, visible, and infrared radiation effects (including laser radiation) / 78.55.Qr – Amorphous materials; glasses and other disordered solids / 83.10.Rs – Computer simulation of molecular and particle dynamics
© EPLA, 2016
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