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Proceedings Paper

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

Paper Details

Date Published: 9 December 2004
PDF: 9 pages
Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); doi: 10.1117/12.567461
Show Author Affiliations
Ludmila V. Chernyshova, Troitsk Institute for Innovation and Fusion Research (Russia)


Published in SPIE Proceedings Vol. 5578:
Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education
Marc Nantel; Glen Herriot; Graham H. McKinnon; Leonard MacEachern; Robert A. Weersink; Rejean Munger; Andrew Ridsdale, Editor(s)

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