15 February 1994 Surface ablation of corneal tissue using UV, green, and IR picosecond laser pulses
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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 1st, 2nd, and 4th 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 5th harmonic at 211 nm.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. H. Niemz, Frieder H. Loesel, Martin Fischer, Christian Lappe, 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); doi: 10.1117/12.168731; https://doi.org/10.1117/12.168731
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