Laser-induced tissue ablation described by linear mass loss model

Dan C. Dumitras; Consuela-Elena Matei; Doru C. A. Dutu

doi:10.1117/12.378153

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25 February 2000 Laser-induced tissue ablation described by linear mass loss model

Dan C. Dumitras, Consuela-Elena Matei, Doru C. A. Dutu

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Proceedings Volume 4070, ALT '99 International Conference on Advanced Laser Technologies; (2000) https://doi.org/10.1117/12.378153
Event: ALT'99 International Conference: Advanced Laser Technologies, 1999, Potenza-Lecce, Italy

Abstract

Tissue ablation by mid-IR lasers is described using the linear mass loss model. The steady state equation, which relates the ablation depth to laser radiant exposure, can be transformed to characterize the dynamic crater formation. After the presentation of the steady state results obtained with the linear mass loss model,the basic equation is transformed into a time dependent equation. To calculate the focusability of laser beams, and hence the irradiance in the focal zone, the spot-size propagation for a Gaussian beam is taken into account. The model can be generalized for higher order modes by introducing the coefficient of beam quality (M²). The analytical solutions of the new equation gives valuable information on crater shape and dimensions on time evolution for crater formation and on time dependence of the ablation velocity. A comparison with experimental results proves usefulness of dynamic characterization of crater formation based on the time dependent linear mass loss model.

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Dan C. Dumitras, Consuela-Elena Matei, and Doru C. A. Dutu "Laser-induced tissue ablation described by linear mass loss model", Proc. SPIE 4070, ALT '99 International Conference on Advanced Laser Technologies, (25 February 2000); https://doi.org/10.1117/12.378153

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