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Further insights on structural modifications occurring during femtosecond laser exposure of fused silica: from nanogratings in the cumulative regime to polymorphic phases forming in laser affected zones (Conference Presentation)
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Paper Abstract

It is generally admitted that femtosecond laser pulses applied to fused silica in a non-ablative regime at repetition rates excluding cumulative effects leads to structural modifications of mainly two types: the formation of nanogratings and a reduction of volume leading to a localized densification. Here, we report recent observations that show that the taxonomy of material modifications induced by the laser is significantly richer than previously known. In particular, we observe evidences of complex polymorphic phases, including possible Si nano-cristallites, eventually embedded in an amorphous shell. In addition, exploring the cumulative regime further, we have observed that nanogratings can also be found in this regime characterized by a melting of the glass phase. This surprising results point out towards complex self-organization phenomena taking place also in the cumulative regime. Both observations, a richer taxonomy of phase transformations in the non-cumulative regime and the occurrence of nanogratings in the cumulative regime, beyond challenging our understanding of laser-induced phase transformation, have interesting applications potential that will be outlined in this presentation.

Paper Details

Date Published: 4 March 2019
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Proc. SPIE 10908, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIX, 1090806 (4 March 2019); doi: 10.1117/12.2515578
Show Author Affiliations
Yves Bellouard, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Charles Pépin, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Eric Ofosu Junior Kissi, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Arunkrishnan Radakrishnan, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Farhang Nabiei, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Philippe Gillet, Ecole Polytechnique Fédérale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 10908:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIX
Peter R. Herman; Michel Meunier; Roberto Osellame, Editor(s)

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