Time-resolved imaging of material response during laser-induced bulk damage in SiO2

S. G. Demos; R. A. Negres

doi:10.1117/12.804245

30 December 2008 Time-resolved imaging of material response during laser-induced bulk damage in SiO₂

S. G. Demos, R. A. Negres

Proceedings Volume 7132, Laser-Induced Damage in Optical Materials: 2008; 71320Q (2008) https://doi.org/10.1117/12.804245
Event: Boulder Damage Symposium XL Annual Symposium on Optical Materials for High Power Lasers, 2008, Boulder, Colorado, United States

Abstract

We report on time resolved imaging of the dynamic events taking place during laser-induced damage in the bulk of fused silica samples with nanosecond temporal resolution and one micron spatial resolution. These events include: shock/pressure wave formation and propagation, transient absorption, crack propagation and formation of residual stress fields. The work has been performed using a time-resolved microscope system that utilizes a probe pulse to acquire images at delay times covering the entire timeline of a damage event. Image information is enhanced using polarized illumination and simultaneously recording the two orthogonal polarization image components. For the case of fused silica, an electronic excitation is first observed accompanied by the onset of a pressure wave generation and propagation. Cracks are seen to form early in the process and reach their final size at about 25 ns into the damage event. In addition, changes that in part are attributed to transient absorption in the modified material are observed for delays up to about 200 microseconds.

Citation Download Citation

S. G. Demos and R. A. Negres "Time-resolved imaging of material response during laser-induced bulk damage in SiO₂", Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 71320Q (30 December 2008); https://doi.org/10.1117/12.804245

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