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Theoretical treatments of ultrashort pulse laser processing of transparent materials: toward understanding the volume nanograting formation and "quill" writing effect

Theoretical treatments of ultrashort pulse laser processing of transparent materials: toward understanding the volume nanograting formation and "quill" writing effect
Theoretical treatments of ultrashort pulse laser processing of transparent materials: toward understanding the volume nanograting formation and "quill" writing effect
The dynamics of ultrashort-laser-induced generation of free electron plasma inside bulk glass is analyzed. The results of modeling are presented for typical glass modification regimes, obtained on the basis of Maxwell's equations supplemented with the equations describing electron plasma formation and the laser-induced electric current. The model has been demonstrated to allow revealing important features of laser beam propagation in the regimes of dense electron plasma generation such as strong scattering up to complete displacing of light from the plasma region followed by beam refocusing. The geometry of the laser energy absorption zone is determined, and the glass temperature is mapped which may be foreseen at the end of electron-glass matrix relaxation. This, in turn, allows estimating the laser-induced stress levels and making conclusions on the routes of glass modification. Finally, based on the modeling results, the plausible mechanisms are discussed which may be responsible for the formation of volume nanogratings in a number of transparent solids under the action ultrashort laser pulses and laser direct writing anisotropy observed for laser pulses with a tilted front.
0946-2171
437–449
Bulgakova, Nadezhda M.
f77016c2-3505-436e-9151-c6a82a8598a2
Zhukov, Vladimir P.
267a4691-3ba1-408f-82cc-5002b61a0db5
Meshcheryakov, Yuri P.
e7855559-6f69-4258-9175-e8d0da4cff64
Bulgakova, Nadezhda M.
f77016c2-3505-436e-9151-c6a82a8598a2
Zhukov, Vladimir P.
267a4691-3ba1-408f-82cc-5002b61a0db5
Meshcheryakov, Yuri P.
e7855559-6f69-4258-9175-e8d0da4cff64

Bulgakova, Nadezhda M., Zhukov, Vladimir P. and Meshcheryakov, Yuri P. (2013) Theoretical treatments of ultrashort pulse laser processing of transparent materials: toward understanding the volume nanograting formation and "quill" writing effect. Applied Physics B, 113 (3), 437–449. (doi:10.1007/s00340-013-5488-0).

Record type: Article

Abstract

The dynamics of ultrashort-laser-induced generation of free electron plasma inside bulk glass is analyzed. The results of modeling are presented for typical glass modification regimes, obtained on the basis of Maxwell's equations supplemented with the equations describing electron plasma formation and the laser-induced electric current. The model has been demonstrated to allow revealing important features of laser beam propagation in the regimes of dense electron plasma generation such as strong scattering up to complete displacing of light from the plasma region followed by beam refocusing. The geometry of the laser energy absorption zone is determined, and the glass temperature is mapped which may be foreseen at the end of electron-glass matrix relaxation. This, in turn, allows estimating the laser-induced stress levels and making conclusions on the routes of glass modification. Finally, based on the modeling results, the plausible mechanisms are discussed which may be responsible for the formation of volume nanogratings in a number of transparent solids under the action ultrashort laser pulses and laser direct writing anisotropy observed for laser pulses with a tilted front.

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Published date: December 2013
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 356373
URI: https://eprints.soton.ac.uk/id/eprint/356373
ISSN: 0946-2171
PURE UUID: b95352d8-e533-4af4-ac71-a23532a4fa21

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Date deposited: 12 Sep 2013 15:29
Last modified: 16 Jul 2019 21:24

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Contributors

Author: Nadezhda M. Bulgakova
Author: Vladimir P. Zhukov
Author: Yuri P. Meshcheryakov

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