Some physical aspects of interaction between a short destructive laser pulse and nonhomogeneous biotissue-like skin

Ludmila V. Chernyshova

doi:10.1117/12.567461

9 December 2004 Some physical aspects of interaction between a short destructive laser pulse and nonhomogeneous biotissue-like skin

Ludmila V. Chernyshova

Author Affiliations +

Proceedings Volume 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education; (2004) https://doi.org/10.1117/12.567461
Event: Photonics North, 2004, Ottawa, Ontario, Canada

Abstract

At laser pulse treatment of skin, the radiation intensity decreases exponentially versus depth; the exponent index includes the biotissue absorption coefficient. The intensity is maximal at the surface leading to preferential heating of superficial layers of skin and if the temperature rises to about 300 C° then both liquid and hard components of the upper layer boil and evaporate. The major part of the incident energy is spent on evaporation of the upper layers rather than deep bulk layers since during a laser pulse the heat front doesn’t spread inside the medium due to a limited thermal conductivity. However, in present work the study was carried out of the case when a nanosecond pulse of near IR optical range strikes the inhomogeneous biotissue like skin comprising substructures with differing optical and physical properties, such a parameter as volume energy density becomes a decisive one for its damage. Its magnitude reaches the damage threshold value only within the substructure whereas the surrounding tissue stays undisturbed.

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Ludmila V. Chernyshova "Some physical aspects of interaction between a short destructive laser pulse and nonhomogeneous biotissue-like skin", Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); https://doi.org/10.1117/12.567461

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KEYWORDS

Skin

Absorption

Tissues

Gas lasers

Laser tissue interaction

Pulsed laser operation

Tissue optics

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