Time-resolved pump-probe microscopy experiments are presented to demonstrate the impact of la-ser-processing parameters onto the fundamental interaction processes between ultrashort laser puls-es 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 exper-iments foresee the extension to Bessel-like beams and multiple focus spots.
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