Beam propagation measurements of holmium laser radiation in biological tissue

Michael Ith; Valerio Romano; Martin Frenz; Heinz P. Weber

doi:10.1117/12.260741

5 December 1996 Beam propagation measurements of holmium laser radiation in biological tissue

Michael Ith, Valerio Romano, Martin Frenz, Heinz P. Weber

Proceedings Volume 2923, Laser-Tissue Interaction and Tissue Optics II; (1996) https://doi.org/10.1117/12.260741
Event: BiOS Europe '96, 1996, Vienna, Austria

Abstract

Although the light distribution during Holmium laser ablation of biological tissue is dominated by absorption like in homogeneous optically uniform media, indications exist that light scattering and thermal lensing also have considerable influence on the light distribution in tissue. These mechanisms influence the ablation threshold and the lateral extent of thermally altered tissue. With a fast temperature measurement technique we are able to measure the spatial beam profile before and after traversing a water layer or a tissue sample of defined thickness. the experiments were done with a free running Ho:YAG laser. The radiation was delivered through a single mode fiber in order to receive a well defined and reproducible laser beam. First results show a broadening of the laser beam after penetration of the sample relative to the incident beam, indicating light scattering and thermal lensing.

Citation Download Citation

Michael Ith, Valerio Romano, Martin Frenz, and Heinz P. Weber "Beam propagation measurements of holmium laser radiation in biological tissue", Proc. SPIE 2923, Laser-Tissue Interaction and Tissue Optics II, (5 December 1996); https://doi.org/10.1117/12.260741

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