Investigation of ablation dynamics as a function of wavelength

Guenther Paltauf; Heinz Schmidt-Kloiber

doi:10.1117/12.182923

17 August 1994 Investigation of ablation dynamics as a function of wavelength

Guenther Paltauf, Heinz Schmidt-Kloiber

Proceedings Volume 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards; (1994) https://doi.org/10.1117/12.182923
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The ablation dynamics after irradiation of an aqueous dye solution with short laser pulses (pulse duration 5 ns) were observed and compared at different wavelengths by use of time- resolved imaging and stress detection methods. As a tunable source of laser radiation an optical parametric oscillator (OPO) was used. Due to the wide tuning range of the OPO (400 nm to 2500 nm) the following two cases could be investigated: variation of the absorption coefficient by changing the wavelength, and changing the absorbing component of the liquid by changing the wavelength from the visible to the infrared while leaving the absorption coefficient constant. In the latter case similar results were obtained at both wavelengths. A variation of the absorption coefficient yielded different results at each wavelength due to the variation of the maximum temperature and thermoelastic pressure values in the target. Relaxation of the pressure at the free surface of the liquid causes a negative stress which together with the high temperature leads to the rapid growth of bubbles and to material ejection.

Citation Download Citation

Guenther Paltauf and Heinz Schmidt-Kloiber "Investigation of ablation dynamics as a function of wavelength", Proc. SPIE 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards, (17 August 1994); https://doi.org/10.1117/12.182923

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