A scattered-light-based system for the probe beam monitoring of laser ablation dynamic

Hanriete Pereira de Souza; Egberto Munin; Leandro Procopio Alves; Marcela Leal Redigolo; Marcos Tadeu Tavares Pacheco

doi:10.1117/12.530535

1 July 2004 A scattered-light-based system for the probe beam monitoring of laser ablation dynamic

Hanriete Pereira de Souza, Egberto Munin, Leandro Procopio Alves, Marcela Leal Redigolo, Marcos Tadeu Tavares Pacheco

Proceedings Volume 5319, Laser Interaction with Tissue and Cells XV; (2004) https://doi.org/10.1117/12.530535
Event: Biomedical Optics 2004, 2004, San Jose, CA, United States

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.

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Hanriete Pereira de Souza, Egberto Munin, Leandro Procopio Alves, Marcela Leal Redigolo, and Marcos Tadeu Tavares Pacheco "A scattered-light-based system for the probe beam monitoring of laser ablation dynamic", Proc. SPIE 5319, Laser Interaction with Tissue and Cells XV, (1 July 2004); https://doi.org/10.1117/12.530535

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KEYWORDS

Laser ablation

Laser beam diagnostics

Light scattering

Helium neon lasers

Tissues

Spectroscopy

Laser tissue interaction

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