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Proceedings Paper

A scattered-light-based system for the probe beam monitoring of laser ablation dynamic
Author(s): Hanriete Pereira de Souza; Egberto Munin; Leandro Procopio Alves; Marcela Leal Redigolo; Marcos Tadeu Tavares Pacheco
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Paper Abstract

In this work we employ a novel probe-beam technique to access the plume dynamics in the laser ablation process. A helium-neon laser in the scattered-beam mode was used to probe the plume. The sample used was a chicken myocardium tissue. The scattered probe light was collected by a 600 mm optical fiber and sent to a ¼ m spectrometer. After finding an adequate acquisition time window, the scattered He-Ne laser light was analyzed for several delay times. The plume luminescence was also collected. While no defined spectral lines could be observed for a 100 μs acquisition time window, a large number of emission lines could be analyzed for the 5 ms gate, the optimum gate window. Our results also show that the ejected material starts to be registered by the spectrometer at about 40 μs after the ablation pulse has been fired. The measurement of the relative atomic composition by means of the laser ablation and the analysis of the ablation plume dynamics were performed. The results pointed out the presence of many elements including sodium, hydrogen and others. Understanding the mechanisms involved in tissue ablation allows reduced damage and better results depending on the application goals.

Paper Details

Date Published: 1 July 2004
PDF: 6 pages
Proc. SPIE 5319, Laser Interaction with Tissue and Cells XV, (1 July 2004); doi: 10.1117/12.530535
Show Author Affiliations
Hanriete Pereira de Souza, Univ. do Vale do Paraiba (Brazil)
Egberto Munin, Univ. do Vale do Paraiba (Brazil)
Leandro Procopio Alves, Univ. do Vale do Paraiba (Brazil)
Marcela Leal Redigolo, Univ. do Vale do Paraiba (Brazil)
Marcos Tadeu Tavares Pacheco, Univ. do Vale do Paraiba (Brazil)

Published in SPIE Proceedings Vol. 5319:
Laser Interaction with Tissue and Cells XV
Steven L. Jacques; William P. Roach, Editor(s)

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