Finite-difference model for laser ablation with emphasis on the role of carbonization and explosive vaporization

Steven L. Jacques

doi:10.1117/12.182957

17 August 1994 Finite-difference model for laser ablation with emphasis on the role of carbonization and explosive vaporization

Steven L. Jacques

Author Affiliations +

Proceedings Volume 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards; (1994) https://doi.org/10.1117/12.182957
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

A finite-difference model provides computer simulations of laser ablation, depicting a dynamic process of surface dessication, temperature rise, carbonization, and explosive subsurface vaporization, which repeats cyclically. The model considers the role of changing tissue optical properties, thermal diffusion, surface water evaporation, water diffusion, tissue dessication, transient carbonization, subsurface explosive vaporization. The parameters of the model were adjusted to yield an ablation velocity, v_abl (mm/s), which matched a typical experimental value from the literature. Then the effect of each parameter on v_abl was examined by plotting v_abl versus variation in that one parameter while holding all other parameters constant. The major factors influencing v_abl appear to be the threshold for explosive vaporization [Q_the(J/cm³)] and the rate of carbonization expressed in terms of its optical absorption [(delta) (mu) _a.carb/(delta) t(cm^-1 s^-1)]. The ablation process is dynamic not constant, but the average ablation velocity can be adequately modeled as the simple boiling of water caused by heat deposition in a 2-5-micrometers time-averaged thickness of carbonized tissue.

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Steven L. Jacques "Finite-difference model for laser ablation with emphasis on the role of carbonization and explosive vaporization", Proc. SPIE 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards, (17 August 1994); https://doi.org/10.1117/12.182957

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