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Proceedings Paper

Lowering threshold energy for femtosecond laser pulse photodisruption through turbid media using adaptive optics
Author(s): A. Hansen; Tammo Ripken; Ronald R. Krueger; Holger Lubatschowski
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Paper Abstract

Focussed femtosecond laser pulses are applied in ophthalmic tissues to create an optical breakdown and therefore a tissue dissection through photodisruption. The threshold irradiance for the optical breakdown depends on the photon density in the focal volume which can be influenced by the pulse energy, the size of the irradiated area (focus), and the irradiation time. For an application in the posterior eye segment the aberrations of the anterior eye elements cause a distortion of the wavefront and therefore an increased focal volume which reduces the photon density and thus raises the required energy for surpassing the threshold irradiance. The influence of adaptive optics on lowering the pulse energy required for photodisruption by refining a distorted focus was investigated. A reduction of the threshold energy can be shown when using adaptive optics. The spatial confinement with adaptive optics furthermore raises the irradiance at constant pulse energy. The lowered threshold energy allows for tissue dissection with reduced peripheral damage. This offers the possibility for moving femtosecond laser surgery from corneal or lental applications in the anterior eye to vitreal or retinal applications in the posterior eye.

Paper Details

Date Published: 16 February 2011
PDF: 6 pages
Proc. SPIE 7885, Ophthalmic Technologies XXI, 78850Q (16 February 2011); doi: 10.1117/12.873838
Show Author Affiliations
A. Hansen, Laser Zentrum Hannover e.V. (Germany)
Tammo Ripken, Laser Zentrum Hannover e.V. (Germany)
Ronald R. Krueger, Cole Eye Institute (United States)
Holger Lubatschowski, Laser Zentrum Hannover e.V. (Germany)


Published in SPIE Proceedings Vol. 7885:
Ophthalmic Technologies XXI
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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