Laser ablation threshold dependence on pulse duration for fused silica and corneal tissues: experiments and modeling.
The surface ablation threshold fluence of fused silica and two porcine cornea layers, the epithelium and the stroma, is characterized as a function of the laser pulse duration in the range of 100 fs-5 ps for a wavelength of 800 nm (Ti:sapphire laser system). The plateaulike region observed between 100 fs and 1 ps for the corneal layers indicates that for use in laser surgery, laser pulse durations chosen within this range should be practically equivalent. Our model predicts that the ablation threshold will decrease rapidly for pulse durations in the low end of the femtosecond regime.
Giguère
Dominic
D
Institut National de la Recherche Scientifique-Energie, Matériaux et Télécommunications, Varennes, Quebec, Canada.
Olivié
Gilles
G
Vidal
François
F
Toetsch
Stéphanie
S
Girard
Guillaume
G
Ozaki
Tsuneyuki
T
Kieffer
Jean-Claude
JC
Nada
Ossama
O
Brunette
Isabelle
I
D003315:Cornea / Q000601:surgery*; D003319:Corneal Stroma / Q000601:surgery; D019573:Epithelium, Corneal / Q000601:surgery; D006801:Humans; D053685:Laser Therapy / Q000379:methods*; D007834:Lasers; D008962:Models, Theoretical; D012822:Silicon Dioxide / Q000528:radiation effects*
D012822:Silicon Dioxide