8 January 2015 Estimation of ultrashort laser irradiation effect over thin transparent biopolymer films morphology
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Proceedings Volume 9447, 18th International School on Quantum Electronics: Laser Physics and Applications; 94470I (2015) https://doi.org/10.1117/12.2177662
Event: Eighteenth International School on Quantum Electronics: Laser Physics and Applications, 2014, Sozopol, Bulgaria
Abstract
The collagen – elastin biopolymer thin films treated by CPA Ti:Sapphire laser (Femtopower – Compact Pro) at 800nm central wavelength with 30fs and 1kHz repetition rate are investigated. A process of surface modifications and microporous scaffold creation after ultrashort laser irradiation has been observed. The single–shot (N=1) and multi–shot (N<1) ablation threshold values were estimated by studying the linear relationship between the square of the crater diameter D2 and the logarithm of the laser fluence F for determination of the threshold fluences for N=1, 2, 5, 10, 15 and 30 number of laser pulses. The incubation analysis by calculation of the incubation coefficient ξ for multi – shot fluence threshold for selected materials by power – law relationship form Fth(N)=Fth(1)Nξ-1 was also obtained. In this paper, we have also shown another consideration of the multi – shot ablation threshold calculation by logarithmic dependence of the ablation rate d on the laser fluence. The morphological surface changes of the modified regions were characterized by scanning electron microscopy to estimate the generated variations after the laser treatment.
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A. Daskalova, C. Nathala, I. Bliznakova, D. Slavov, W. Husinsky, "Estimation of ultrashort laser irradiation effect over thin transparent biopolymer films morphology", Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 94470I (8 January 2015); doi: 10.1117/12.2177662; https://doi.org/10.1117/12.2177662
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