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Journal of Biomedical Optics • Open Access

Effects of cavitation bubble interaction with temporally separated fs-laser pulses
Author(s): Nadine Tinne; Gesche Knoop; Nicole Kallweit; Sonja Veith; Sebastian Bleeker; Holger Lubatschowski; Alexander Krüger; Tammo Ripken

Paper Abstract

We present a time-resolved photographic analysis of the pulse-to-pulse interaction. In particular, we studied the influence of the cavitation bubble induced by a fs-pulse on the optical focusing of the consecutive pulse and its cavitation bubble dynamics in dependence on temporal pulse separation in water. As a first result, by decreasing the temporal separation of laser pulses, there is a diminishment of the laser-induced optical breakdown (LIOB) efficiency in terms of energy conversion, caused by disturbed focusing into persisting gas bubbles at the focal volume. A LIOB at the focal spot is finally suppressed by impinging the expanding or collapsing cavitation bubble of the preceding pulse. These results could be additionally confirmed in porcine gelatin solution with various concentrations. Hence, the interaction between the laser and transparent ophthalmic tissue may be accompanied by a raised central laser energy transmission, which could be observed in case of a temporal pulse overlap. In conclusion, our experimental results are of particular importance for the optimization of the prospective ophthalmic surgical process with future generation fs-lasers.

Paper Details

Date Published: 28 April 2014
PDF: 12 pages
J. Biomed. Opt. 19(4) 048001 doi: 10.1117/1.JBO.19.4.048001
Published in: Journal of Biomedical Optics Volume 19, Issue 4
Show Author Affiliations
Nadine Tinne, Laser Zentrum Hannover e.V. (Germany)
Gesche Knoop, Laser Zentrum Hannover e.V. (Germany)
Nicole Kallweit, Laser Zentrum Hannover e.V. (Germany)
Sonja Veith, Laser Zentrum Hannover e.V. (Germany)
Sebastian Bleeker, Laser Zentrum Hannover e.V. (Germany)
Holger Lubatschowski, Gottfried Wilhelm Leibniz Univ. Hannover (Germany)
Alexander Krüger, Laser Zentrum Hannover e.V. (Germany)
Tammo Ripken, Laser Zentrum Hannover e.V. (Germany)

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