Modification of transparent materials with ultrashort laser pulses: What is energetically and mechanically meaningful?

A comprehensive analysis of laser-induced modification of bulk glass by single ultrashort laser pulses is presented which is based on combination of optical Maxwell-based modeling with thermoelastoplastic simulations of post-irradiation behavior of matter. A controversial question on free electron d...

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Bibliographic Details
Published in:Journal of applied physics 2015-12, Vol.118 (23)
Main Authors: Bulgakova, Nadezhda M., Zhukov, Vladimir P., Sonina, Svetlana V., Meshcheryakov, Yuri P.
Format: Article
Language:English
Subjects:
Applied physics
BEAM TRANSPORT
Bulk density
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
Direct laser writing
ELECTRON DENSITY
ENERGY BALANCE
EXPERIMENTAL DATA
Fused silica
GLASS
Laser beams
LASERS
LIGHT TRANSMISSION
MATERIALS
MAXWELL EQUATIONS
Modelling
MODIFICATIONS
PULSES
Relocation
SILICA
Silicon dioxide
SIMULATION
STRESSES
Three dimensional models
THREE-DIMENSIONAL CALCULATIONS
Time
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Summary:A comprehensive analysis of laser-induced modification of bulk glass by single ultrashort laser pulses is presented which is based on combination of optical Maxwell-based modeling with thermoelastoplastic simulations of post-irradiation behavior of matter. A controversial question on free electron density generated inside bulk glass by ultrashort laser pulses in modification regimes is addressed on energy balance grounds. Spatiotemporal dynamics of laser beam propagation in fused silica have been elucidated for the regimes used for direct laser writing in bulk glass. 3D thermoelastoplastic modeling of material relocation dynamics under laser-induced stresses has been performed up to the microsecond timescale when all motions in the material decay. The final modification structure is found to be imprinted into material matrix already at sub-nanosecond timescale. Modeling results agree well with available experimental data on laser light transmission through the sample and the final modification structure.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4937896