[Zurück]

A. Daskalova, C. Nathala, I. Bliznakova, D. Slavov, W. Husinsky et al.:
"Estimation of ultrashort laser irradiation effect over thin transparent biopolymer films morphology";
in: "18th International School on Quantum Electronics: Laser Physics and Applications, Book Series: E (eds. T. Dreischuh, S. Gateva, A. Serafetinides)", 9447; Proc. of SPIE, 2015, S. 9447011 - 9447017.

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.

Biopolymers, surface modification, tissue engineering, ultrashort laser irradiation, single - shot ablation threshold, incubation coefficient, ablation rate