The influence of a spatial and temporal pulse-over-lap on the laser-tissue-interaction of modern ophthalmic laser systems
Conference of the German Society for Biomedical Engineering (BMT)
16.-19. September
Jena
2012
Type: Konferenzbeitrag
Abstract
The presented study describes a time-resolved photographic analysis of the interaction of temporally separated cavitation bubbles generated by femtosecond laser-induced optical breakdown in water. For the interaction of laser pulses with a spatial and temporal overlap has scarcely been studied yet, we investigated the interaction of two or more temporally separated laser pulses by time-resolved photography. Various regimes were created using a pulse picker: Focusing a second laser pulse (i) into an existing cavitation bubble, (ii) into persisting gas bubbles and (iii) focusing three subsequent laser pulses. While the probability of causing two successive laser-induced optical breakdowns distinctly decreases in scenario (ii), no bubble oscillation caused by the second pulse can be observed within (i). Hence, the laser-tissue interaction might be accompanied by a raised laser energy transmission. In Conclusion, the results of this study are of great interest for the prospective optimization of the surgical process with high-repetition rate fs-lasers.