Open AccessWavelength dependence of femtosecond laser ablation threshold of corneal stroma
Author(s) -
G. Olivié,
D. Giguère,
François Vidal,
T. Ozaki,
JeanClaude Kieffer,
Ossama Nada,
Isabelle Brunette
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.004121
Subject(s) - optics , materials science , ablation , wavelength , femtosecond , fluence , laser , laser ablation , sapphire , optoelectronics , physics , engineering , aerospace engineering
We measure the surface ablation threshold fluence of porcine corneal stroma for 100 fs laser pulses, with wavelengths between 800 nm and 1450 nm, generated by a Ti:sapphire-pumped optical parametric amplifier. The ablation threshold was found to vary only slightly within this wavelength range, between 1.5 and 2.2 J/cm(2). The data suggest a rapid increase of the ablation threshold for wavelengths up to about 1000 nm, followed by a plateau for longer wavelengths. This behavior is partly confirmed by a simple theoretical model of the ablation process. The influence of the wavelength on the physics of surface ablation is discussed on the basis of the model.