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.

Interaction of subsequent laser pulses becomes important relevant with the use of high-repetition rate fs-laser systems for ophthalmic laser surgery. Therefore, we investigated the interaction of temporally separated laser pulses in water by time-resolved photography. With decreasing temporal separation of pulses the probability of laser-induced optical breakdown (LIOB) is firstly diminished by disturbed focusing into persisting gas bubbles. Finally, LIOB is totally impaired by the expanding or collapsing cavitation of the preceding pulse. Hence, laser-tissue interaction might be accompanied by a raised laser energy transmission. In conclusion, these results are of great interest for the prospective optimization of the ophthalmic surgical process with modern fs-lasers.

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We present a time-resolved photographic analysis of the pulse-to-pulse interaction of temporally separated fs-laser pulses with various pulse overlap in water. Initially, by decreasing the temporal separation of laser pulses there is a diminishment of the laser-induced optical breakdown (LIOB) probability, caused by focusing into persisting gas bubbles at the focal volume. A LIOB at the focal spot is finally impaired by the oscillating cavitation bubble of the preceding pulse. Hence, the interaction between the laser and transparent ophthalmic tissue may be accompanied by a raised laser energy transmission and a variation in the axial cutting depth, which could be observed in case of a 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.