Time-resolved imaging of material response during laser-induced bulk damage in SiO 2

S. G. Demos, R. A. Negres

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7132
DOIs
StatePublished - 2008
Externally publishedYes
Event40th Annual Boulder Damage Symposium - Laser-Induced Damage in Optical Materials: 2008 - Boulder, CO, United States
Duration: Sep 22 2008Sep 24 2008

Other

Other40th Annual Boulder Damage Symposium - Laser-Induced Damage in Optical Materials: 2008
CountryUnited States
CityBoulder, CO
Period9/22/089/24/08

Keywords

  • Damage mechanisms
  • Fused silica
  • Laser damage
  • Laser-induced modifications

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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