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Proceedings Paper

Self-focusing and maximum ablation depth in ultrafast laser surgery of tissue (Conference Presentation)
Author(s): Chris Martin; Adela Ben-Yakar
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Paper Abstract

Ultrafast lasers are used to precisely ablate tissue below the surface. The maximum depth of ablation is ultimately limited by scattering and absorption by the tissue. As the depth of ablation is increased, higher laser powers are required to reach the ablation threshold at the laser focus, which leads to nonlinear self-focusing or surface damage. Here, we investigate self-focusing and the maximum depth of ablation in tissue experimentally and computationally. We find the maximum ablation depth in a model porcine tissue for a variety of focusing conditions and pulse widths by imaging ablation voids with third-harmonic generation imaging. The effect of self-focusing is measured by the shift in the focal plane of the ablation void and by the presence of self-focusing induced filaments. Computational models simulate laser pulse propagation and free-electron generation in tissue. Using our experimental data, we fit a nonlinear index to tissue. We then use the model to predict the role of self-focusing and the maximum ablation depth for a range of laser parameters.

Paper Details

Date Published: 14 March 2018
Proc. SPIE 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII, 105220B (14 March 2018); doi: 10.1117/12.2290777
Show Author Affiliations
Chris Martin, The Univ. of Texas at Austin (United States)
Adela Ben-Yakar, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 10522:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII
Peter R. Herman; Michel Meunier; Roberto Osellame, Editor(s)

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