Surface ablation of corneal tissue using UV, green, and IR picosecond laser pulses

M. H. Niemz; Frieder H. Loesel; Martin Fischer; Christian Lappe; Josef F. Bille

doi:10.1117/12.168731

15 February 1994 Surface ablation of corneal tissue using UV, green, and IR picosecond laser pulses

M. H. Niemz, Frieder H. Loesel, Martin Fischer, Christian Lappe, Josef F. Bille

Proceedings Volume 2079, Laser Applications in Ophthalmology; (1994) https://doi.org/10.1117/12.168731
Event: Europto Biomedical Optics '93, 1993, Budapest, Hungary

Abstract

The effect of different wavelengths on corneal tissue ablation has been studied using the 1^st, 2^nd, and 4^th harmonics of a picosecond Nd:YLF laser system. This laser system consists of an actively mode locked Nd:YLF oscillator generating 30 ps pulses and a regenerative amplifier. The laser beam was focussed onto fresh human donor or calf corneas. The corneas could be moved in 3D patterns using computer controlled stepping motors. The amount of the ablated tissue and the quality of the resulting surfaces were judged by light and scanning electron microscopy. The histology showed that the ablation depths of the IR and green laser pulses are very similar at a given energy density. SEMs revealed that UV light causes a denser packaging of the underlying collagen fibers, similar to the pseudo Bowman's membrane generated with excimer lasers. Further studies are planned concerning the investigation of the 5^th harmonic at 211 nm.

Citation Download Citation

M. H. Niemz, Frieder H. Loesel, Martin Fischer, Christian Lappe, and Josef F. Bille "Surface ablation of corneal tissue using UV, green, and IR picosecond laser pulses", Proc. SPIE 2079, Laser Applications in Ophthalmology, (15 February 1994); https://doi.org/10.1117/12.168731

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