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dc.contributor.authorPuerto, D.-
dc.contributor.authorSiegel, Jan-
dc.contributor.authorFerrer, Andrés-
dc.contributor.authorHernández Rueda, Javier-
dc.contributor.authorSolís Céspedes, Javier-
dc.date.accessioned2013-01-29T11:39:38Z-
dc.date.available2013-01-29T11:39:38Z-
dc.date.issued2012-
dc.identifierdoi: 10.1364/JOSAB.29.002665-
dc.identifierissn: 0740-3224-
dc.identifier.citationJournal of the Optical Society of America B: Optical Physics 29: 2665-2668 (2012)-
dc.identifier.urihttp://hdl.handle.net/10261/65393-
dc.description.abstractA study of the surface modification induced by single femtosecond laser pulses in phosphate glass has revealed surface swelling at fluences just below the ablation threshold. This behavior is different from that observed in other dielectric materials. Optical micrographs obtained with monochromatic light show a pattern of Newton rings within the swollen region whose number scales inversely with the illumination wavelength, acting as a micro Fabry-Perot etalon. The swollen surface layer has lower refractive index than the bulk glass and can reach a maximum thickness of 820 nm. We relate these findings to results obtained during subsurface waveguide writing inside phosphate glass, which also show a refractive index decrease at energies near threshold for waveguide fabrication. We have identified low density free-electron plasma to be the trigger of the refractive index change. © 2012 Optical Society of America.-
dc.description.sponsorshipThis work has been partially supported by the Spanish TEC 2008- 01183 and TEC2011-22422. D. Puerto acknowledges his grant of the Spanish Ministry of Science and Education under TEC 2005-0007 and JCI-2010-07479.-
dc.language.isoeng-
dc.publisherOptical Society of America-
dc.rightsopenAccess-
dc.titleCorrelation of the refractive index change at the surface and inside phosphate glass upon femtosecond laser irradiation-
dc.typeartículo-
dc.identifier.doi10.1364/JOSAB.29.002665-
dc.date.updated2013-01-29T11:39:38Z-
dc.description.versionPeer Reviewed-
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