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Multi pulse pump-probe diagnostics for development of advanced transparent materials processing

: Jenne, M.; Zimmermann, F.; Flamm, D.; Grossmann, D.; Kleiner, J.; Kumkar, M.; Nolte, S.


Journal of Laser Micro/Nanoengineering. Online journal 13 (2018), No.3, pp.273-279
ISSN: 1880-0688
Journal Article
Fraunhofer IOF ()

Time-resolved pump-probe microscopy experiments are presented to demonstrate the impact of laser-processing parameters onto the fundamental interaction processes between ultrashort laser pulses and glass. Our approach includes the implementation of polarization microscopy to detect the transient buildup of pressure waves and stress from single-shot and multi-pulse experiments. The presented data gives insight into the interplay between pulse duration and repetition rate. We see a decrease in length of the absorption zone for increasing pulse durations. The temporal delay be-tween consecutive pulses changes the length of the modification and the strength. Additional experiments foresee the extension to Bessel-like beams and multiple focus spots.