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D. Giguere, G. Olivie, O. Nada, T. Ozaki, F. Vidal, I. Brunette, J.–C. Kieffer; Femtosecond Laser Ablation Threshold for Cornea as a Function of the Wavelength . Invest. Ophthalmol. Vis. Sci. 2006;47(13):528.
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© ARVO (1962-2015); The Authors (2016-present)
Potential applications of the femtosecond laser to corneal surgery are very promising. The goal of this study is to describe femtosecond laser ablation thresholds of different corneal layers as a function of the laser wavelength. This will be useful to benchmark calculations.
We used the INRS ALLS laser facility for this investigation and more precisly the 100 Hz OPA system. We investigated the ablation threshold in the range 800 nm–1600 nm with pulse having energy of 1 mJ and duration around 30 fs. The laser pulse was focused using a reflective microscope objective (Numerical Aperture of 0.5) on the sample surface – a freshly enucluated pig eye.The threshold was defined as the lowest energy that gives a visible optical damage with a high resolution optical microscope.
Dependance of ablation threshold with wavelength will be reported. Preliminary results indicate that the ablation threshold increases from 2 J/cm2 at 800 nm to 10 J/cm2 at 1450 nm. Experimental results will be compared with our numerical model and important intrinsic physical parameters for cornea layers will be deduced.
Ablation threshold for cornea layers were investigated for different wavelengths. The results are used to benchmark our numerical model which allow us to determine cornea physical parameters involved in laser tissues interaction.
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