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Proceedings Paper

Surface ablation of corneal tissue using UV, green, and IR picosecond laser pulses
Author(s): M. H. Niemz; Frieder H. Loesel; Martin Fischer; Christian Lappe; Josef F. Bille
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Paper 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.

Paper Details

Date Published: 15 February 1994
PDF: 9 pages
Proc. SPIE 2079, Laser Applications in Ophthalmology, (15 February 1994); doi: 10.1117/12.168731
Show Author Affiliations
M. H. Niemz, Univ. of Heidelberg (Germany)
Frieder H. Loesel, Univ. of Heidelberg (Germany)
Martin Fischer, Univ. of Heidelberg (Germany)
Christian Lappe, Univ. of Heidelberg (Germany)
Josef F. Bille, Univ. of Heidelberg (Germany)


Published in SPIE Proceedings Vol. 2079:
Laser Applications in Ophthalmology
Shlomo Timor Melamed, Editor(s)

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