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Proceedings Paper

Time-resolved observation of thermal and mechanical effects in tissue models induced by short laser pulses from an optical parametric oscillator
Author(s): Guenther Paltauf; Heinz Schmidt-Kloiber
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Paper Abstract

Heat and stress generation in water are investigated after irradiation with single, short pulses (5 ns duration) from an optical parametric oscillator (OPO), using piezoelectric stress detection, an optical pump-probe technique and laser-flash photography. The wavelength dependence of these effects is studied in the near infrared by choosing some wavelengths at the absorption peak between 1900 nm and 2050 nm from the wide tuning range of the OPO (400 nm - 2500 nm). Time-resolved temperature profiles show the relatively slow decay of the heat generated by absorption of a pulse, leading to the possibility of heat accumulation by successive pulses. Relaxation of the thermoelastic stress near a free surface causes cavitation and liquid ejection. This effect can be intensified by vaporization. The observation that the ablative effects of heat and stress are maximized at the absorption peak demonstrates the applicability of the OPO for optimized tissue ablation.

Paper Details

Date Published: 1 February 1994
PDF: 10 pages
Proc. SPIE 2077, Laser Interaction with Hard and Soft Tissue, (1 February 1994); doi: 10.1117/12.168027
Show Author Affiliations
Guenther Paltauf, Karl-Franzens-Univ. Graz (Austria)
Heinz Schmidt-Kloiber, Karl-Franzens-Univ. Graz (Austria)


Published in SPIE Proceedings Vol. 2077:
Laser Interaction with Hard and Soft Tissue
Martin J. C. van Gemert; Rudolf W. Steiner; Lars Othar Svaasand; Hansjoerg Albrecht, Editor(s)

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