Poly(methyl methacrylate) (PMMA) was irradiated using a medical UV-ArF excimer laser operating at the fundamental wavelength of 193nm. Characterized by a beam diameter of 1.8mm and energy of 180mJ with a Gaussian energy profile, it operates in a single mode or at 30Hz repetition rate. Mechanical profilometry was carried out on ablation craters in order to study the rugosity and the ablation yield in the various operative conditions. Optical transmission and reflection measurements at six wavelengths were conducted in order to characterize the optical properties of the irradiated surfaces. Measured crater depths in PMMA were lower with respect to the forecasted ones in corneal tissue, while the lateral crater aperture was maintained. The rugosity produced at the crater bottom after irradiation was about 0.3m, and the ablation yield was about 10 15molecules/laser pulse, while etching depth and diameter show a roughly linear dependence on the number of laser shots. These experiments constitute a base for deeper clinical investigations. © 2012 Copyright Taylor and Francis Group, LLC.
Radiation effects on poly(methyl methacrylate) induced by pulsed laser irradiations
TORRISI, Lorenzo;Italiano A.;AMATO, ERNESTO;CARIDI, Francesco;SQUERI, Carlo Attilio;SQUERI, GIUSEPPE;Roszkowska A. M.
2012-01-01
Abstract
Poly(methyl methacrylate) (PMMA) was irradiated using a medical UV-ArF excimer laser operating at the fundamental wavelength of 193nm. Characterized by a beam diameter of 1.8mm and energy of 180mJ with a Gaussian energy profile, it operates in a single mode or at 30Hz repetition rate. Mechanical profilometry was carried out on ablation craters in order to study the rugosity and the ablation yield in the various operative conditions. Optical transmission and reflection measurements at six wavelengths were conducted in order to characterize the optical properties of the irradiated surfaces. Measured crater depths in PMMA were lower with respect to the forecasted ones in corneal tissue, while the lateral crater aperture was maintained. The rugosity produced at the crater bottom after irradiation was about 0.3m, and the ablation yield was about 10 15molecules/laser pulse, while etching depth and diameter show a roughly linear dependence on the number of laser shots. These experiments constitute a base for deeper clinical investigations. © 2012 Copyright Taylor and Francis Group, LLC.Pubblicazioni consigliate
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