Laser ablation and high precision patterning of biomaterials and intraocular lenses

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dc.contributor.author Serafetinides, AA en
dc.contributor.author Spyratou, E en
dc.contributor.author Makropoulou, M en
dc.date.accessioned 2014-03-01T02:53:20Z
dc.date.available 2014-03-01T02:53:20Z
dc.date.issued 2011 en
dc.identifier.issn 0277786X en
dc.identifier.uri http://hdl.handle.net/123456789/36243
dc.subject.other Ablation efficiency en
dc.subject.other Ablation mechanisms en
dc.subject.other Ablation rates en
dc.subject.other Cataract surgeries en
dc.subject.other Conventional techniques en
dc.subject.other Crater wall en
dc.subject.other Etched patterns en
dc.subject.other Heat diffusions en
dc.subject.other High precision en
dc.subject.other Irradiated polymers en
dc.subject.other Laser energy fluence en
dc.subject.other Mathematical modeling en
dc.subject.other Multifocal en
dc.subject.other New material en
dc.subject.other Organic polymer material en
dc.subject.other Polymer materials en
dc.subject.other SEM en
dc.subject.other Short laser pulse en
dc.subject.other Surface modification en
dc.subject.other Surface processing en
dc.subject.other Thermal damage en
dc.subject.other Ultrashort laser pulse en
dc.subject.other Atomic force microscopy en
dc.subject.other Biological materials en
dc.subject.other Contact lenses en
dc.subject.other Electron optics en
dc.subject.other Intraocular lenses en
dc.subject.other Laser ablation en
dc.subject.other Laser applications en
dc.subject.other Laser pulses en
dc.subject.other Optical instruments en
dc.subject.other Optical properties en
dc.subject.other Organic lasers en
dc.subject.other Organic polymers en
dc.subject.other Polymers en
dc.subject.other Quantum electronics en
dc.subject.other Scanning electron microscopy en
dc.subject.other Surface testing en
dc.subject.other Surfaces en
dc.subject.other Pulsed lasers en
dc.title Laser ablation and high precision patterning of biomaterials and intraocular lenses en
heal.type conferenceItem en
heal.identifier.primary 10.1117/12.882844 en
heal.identifier.secondary http://dx.doi.org/10.1117/12.882844 en
heal.identifier.secondary 77470V en
heal.publicationDate 2011 en
heal.abstract The use of intraocular lenses (IOL) is the most promising method for restoring excellent vision in cataract surgery. In addition, multifocal intraocular lenses for good distant and near vision are investigated. Several new materials, techniques and patterns are studied for the formation and etching of intraocular lenses in order to improve their optical properties and reduce the diffractive aberrations. As pulsed laser ablation is well established as a universal tool for surface processing of organic polymer materials, this study was focused in using laser ablation with short and ultra short laser pulses for surface modification of PMMA and intraocular lenses, instead of using other conventional techniques. The main advantage of using very short laser pulses, e.g. of ns, ps or fs duration, is that heat diffusion into the polymer material is negligible. As a result high precision patterning of the sample, without thermal damage of the surroundings, becomes possible. In this study, laser ablation was performed using commercially available hydrophobic acrylic IOLs, hydrophilic acrylic IOLs, and PMMA IOLs, with various diopters. We investigated the ablation efficiency and the phenomenology of the etched patterns by testing the ablation rate, versus laser energy fluence, at several wavelengths and the surface modification with atomic force microscopy (AFM), or scanning electron microscopy (SEM). The irradiated polymers have different optical properties, at the applied wavelengths, and therefore, present different ablation behaviour and morphology of the laser ablated crater walls and surrounding surfaces. The experimental results, some theoretical assumptions for mathematical modeling of the relevant ablation mechanisms are discussed. © 2011 SPIE. en
heal.journalName Proceedings of SPIE - The International Society for Optical Engineering en
dc.identifier.doi 10.1117/12.882844 en
dc.identifier.volume 7747 en

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