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The role of thermal accumulation on the fabrication of diffraction gratings in ophthalmic PHEMA by ultrashort laser direct writing

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dc.contributor.authorSola Martínez, Daniel
dc.contributor.authorVázquez de Aldana, Javier R.
dc.contributor.authorArtal Soriano, Pablo
dc.contributor.departmentFísica
dc.date.accessioned2025-12-16T13:14:05Z
dc.date.available2025-12-16T13:14:05Z
dc.date.copyright© 2020 by the authors
dc.date.issued2020-12-11
dc.description.abstractThe fabrication of diffraction gratings by ultrashort direct laser writing in poly-hydroxyethyl-methacrylate (PHEMA) polymers used as soft contact lenses is reported. Diffraction gratings were inscribed by focusing laser radiation 100 µm underneath the surface of the samples. Low- and high-repetition rate Ti:sapphire lasers with 120 fs pulsewidth working at 1 kHz and 80 MHz respectively were used to assess the role of thermal accumulation on microstructural and optical characteristics. Periodic patterns were produced for different values of repetition rate, pulse energy, laser wavelength, distance between tracks, and scanning speed. Compositional and structural modifications of the processed areas were studied by micro-Raman spectroscopy showing that under certain parameters, thermal accumulation may result in local densification. Far-field diffraction patterns were recorded for the produced gratings to assess the refractive index change induced in the processed areas.
dc.formatapplication/pdf
dc.format.extent12
dc.identifier.citationPolymers 2020, 12, 296
dc.identifier.doihttps://doi.org/10.3390/polym12122965
dc.identifier.eissn2073-4360
dc.identifier.urihttp://hdl.handle.net/10201/180509
dc.languageeng
dc.publisherMDPI
dc.relationFundación Séneca grant No 20647/JLI/18, Junta de Castilla y León (project SA287P18),MINECO (project FIS2017-87970-R) and European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie IF No 795630
dc.relation.publisherversionhttps://www.mdpi.com/2073-4360/12/12/2965
dc.rightsAttribution 4.0 International*
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectUltrafast laser inscription
dc.subjectLaser materials processing
dc.subjectPolymers
dc.subjectDiffraction gratings
dc.subjectOphthalmic material
dc.subject.odsNo relacionado con ningún objetivo de desarrollo sostenible
dc.titleThe role of thermal accumulation on the fabrication of diffraction gratings in ophthalmic PHEMA by ultrashort laser direct writing
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/publishedVersión
dspace.entity.typePublicationes
relation.isAuthorOfPublicationce354418-1935-4dab-b53f-a30b5c6e9a53
relation.isAuthorOfPublication80be2390-46ed-4e4f-8ac2-625e43728a67
relation.isAuthorOfPublication.latestForDiscoveryce354418-1935-4dab-b53f-a30b5c6e9a53
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