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Proceedings Paper

Temperature Changes During Photoablation Processes
Author(s): M. Steinmetz
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Paper Abstract

The results of current microscopic investigations show that during the process of athermal photoablation the material surrounding the target is thermally stressed. In order to get more information of the target's thermal behaviour during light interaction and, furthermore, about the process itself, we developed a microthermocouple device with high spatial (um) and temporal (us) resolution. So far temperature measurements were carried out during excimer laser (351nm) irradiation with 250 to 1600 mJ/cm2 in single and repetition pulse mode. The measurements in polymers and in biological material gave the following results: 1) typical thermal effects like melting zones at polymer crater walls and tissue discoloration and smoke generation in biologic material. 2) In polymers as well as in biological materials the surface temperature increases with increasing energy density in single laser mode once the removal threshold is reached or exceeded. 3) The removal threshold depends on the heat capacity of the samples. The results indicate that photoablation of polymers and biological material (obtained with 351 nm short pulsed laser light wavelength of nearly 1000 mJ/cm2) is predominantly a photothermal process.

Paper Details

Date Published: 16 December 1988
PDF: 5 pages
Proc. SPIE 0998, Excimer Beam Applications, (16 December 1988); doi: 10.1117/12.960209
Show Author Affiliations
M. Steinmetz, Medizinisches Laserzentrum Lubeck (FRG)

Published in SPIE Proceedings Vol. 0998:
Excimer Beam Applications
Anthony N. Pirri; Bernhard P. Piwczyk, Editor(s)

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