Estimation of ultrashort laser irradiation effect over thin transparent biopolymer films morphology

A. Daskalova; C. Nathala; I. Bliznakova; D. Slavov; W. Husinsky

doi:10.1117/12.2177662

8 January 2015 Estimation of ultrashort laser irradiation effect over thin transparent biopolymer films morphology

A. Daskalova, C. Nathala, I. Bliznakova, D. Slavov, W. Husinsky

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)N^ξ-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.

Citation Download Citation

A. Daskalova, C. Nathala, I. Bliznakova, D. Slavov, and 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); https://doi.org/10.1117/12.2177662

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