Effects of cavitation bubble interaction with temporally separated fs-laser pulses.
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.
Laser Zentrum Hannover e.V., Biomedical Optics Department, Hollerithallee 8, Hannover 30419, Germany.
Nadine
N
Tinne
Laser Zentrum Hannover e.V., Biomedical Optics Department, Hollerithallee 8, Hannover 30419, Germany.
Gesche
G
Knoop
Laser Zentrum Hannover e.V., Biomedical Optics Department, Hollerithallee 8, Hannover 30419, Germany.
Nicole
N
Kallweit
Laser Zentrum Hannover e.V., Biomedical Optics Department, Hollerithallee 8, Hannover 30419, Germany.
Sonja
S
Veith
Laser Zentrum Hannover e.V., Biomedical Optics Department, Hollerithallee 8, Hannover 30419, Germany.
Sebastian
S
Bleeker
Gottfried Wilhelm Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, Hannover 30167, Germany.
Holger
H
Lubatschowski
Laser Zentrum Hannover e.V., Biomedical Optics Department, Hollerithallee 8, Hannover 30419, Germany.
Alexander
A
Krüger
Laser Zentrum Hannover e.V., Biomedical Optics Department, Hollerithallee 8, Hannover 30419, Germany.
Tammo
T
Ripken
D000818:Animals; D004867:Equipment Design; D005740:Gases / Q000737:chemistry*; D053685:Laser Therapy / Q000295:instrumentation / Q000379:methods*; D007834:Lasers; D008954:Models, Biological; D010781:Photography; D013552:Swine
D005740:Gases