Laser-flash photography of laser-induced spallation in liquid media

Steven L. Jacques; Gary Gofstein; Ronald S. Dingus

doi:10.1117/12.137470

7 August 1992 Laser-flash photography of laser-induced spallation in liquid media

Steven L. Jacques, Gary Gofstein, Ronald S. Dingus

Proceedings Volume 1646, Laser-Tissue Interaction III; (1992) https://doi.org/10.1117/12.137470
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

Laser-flash photography was used to document the onset of cavitation bubbles induced in liquid media by Q-switched laser pulses. Such bubbles are hypothesized to indicate the 'breakage of water' by negative stress caused by the inverting reflectance of a laser-induced propagating stress wave at the air/liquid interface. Absorption of the pulsed laser by the liquid caused thermoelastic expansion which generated the initial stress distribution. These liquid phantom experiments model the situation for tissues where such 'breakage' of the tissue structure can contribute to the process of tissue removal by the phenomenon called 'spallation'. The threshold dosimetry for cavitation and explosive vaporization were determined. The threshold negative stress for onset of water cavitation under the dynamic stress conditions induced by approximately 140-ns laser pulses is approximately -8 bars.

Citation Download Citation

Steven L. Jacques, Gary Gofstein, and Ronald S. Dingus "Laser-flash photography of laser-induced spallation in liquid media", Proc. SPIE 1646, Laser-Tissue Interaction III, (7 August 1992); https://doi.org/10.1117/12.137470

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