We report on the material response during the cooling phase in bulk fused silica following localized energy deposition via laser-induced breakdown. We use a time-resolved microscope system to acquire images of the region of energy deposition at delay times covering the entire timeline of events. In addition, this system is configured to perform pump-and-probe damage testing measurements to investigate the evolution of the transient absorption of the modified material. The main features of a damage site are established at ∼30 ns after the pump pulse, i.e. cracks reach their final size within this time frame. The results reveal that the cracks and melted core exhibit a transient absorption up until about 300 ns and 200 μs delay times, respectively, and suggest that the melted region returns to solid phase at ∼70 ms delay.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics