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Proceedings Paper

Interaction dynamics of temporal and spatial separated cavitation bubbles in water
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Paper Abstract

The LASIK procedure is a well established laser based treatment in ophthalmology. Nowadays it includes a cutting of the corneal tissue bases on ultra short pulses which are focused below the tissue surface to create an optical breakdown and hence a dissection of the tissue. The energy of the laser pulse is absorbed by non-linear processes that result in an expansion of a cavitation bubble and rupturing of the tissue. Due to a reduction of the duration of treatment the current development of ultra short laser systems points to higher repetition rates. This in turn results in a probable interaction between different cavitation bubbles of adjacent optical breakdowns. While the interaction of one single laser pulse with biological tissue is analyzed reasonably well experimentally and theoretically, the interaction of several spatial and temporal following pulses is scarcely determined yet. We present a high-speed photography analysis of cavitation bubble interaction for two spatial separated laser-induced optical breakdowns varying the laser pulse energy as well as the spatial distance. Depending on a change of these parameters different kinds of interactions such as a flattening and deformation of bubble shape, asymmetric water streams and jet formation were observed. The results of this research can be used to comprehend and optimize the cutting effect of ultra short pulse laser systems with high repetition rates (> 1 MHz).

Paper Details

Date Published: 22 February 2010
PDF: 10 pages
Proc. SPIE 7562, Optical Interactions with Tissues and Cells XXI, 75620O (22 February 2010); doi: 10.1117/12.841285
Show Author Affiliations
N. Tinne, Laser Zentrum Hannover e.V. (Germany)
Rowiak GmbH (Germany)
T. Ripken, Laser Zentrum Hannover e.V. (Germany)
H. Lubatschowski, Laser Zentrum Hannover e.V. (Germany)
Rowiak GmbH (Germany)

Published in SPIE Proceedings Vol. 7562:
Optical Interactions with Tissues and Cells XXI
E. Duco Jansen; Robert J. Thomas, Editor(s)

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