Morphology of ejected debris from laser super-heated fused silica following exit surface laser-induced damage

Stavros G. Demos, Raluca A. Negres, Rajesh N. Raman, Michael D. Feit, Kenneth R. Manes, Alexander M. Rubenchik

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

3 Scopus citations

Abstract

Laser induced damage (breakdown) initiated on the exit surface of transparent dielectric materials using nanosecond pulses creates a volume of superheated material reaching localized temperatures on the order of 1 eV and pressures on the order of 10 GPa or larger. This leads to material ejection and the formation of a crater. The volume of this superheated material depends largely on the laser parameters such as fluence and pulse duration. To elucidate the material behaviors involved, we examined the morphologies of the ejected superheated material particles and found distinctive morphologies. We hypothesize that these morphologies arise from the difference in the structure and physical properties (such as the dynamic viscosity and presence of instabilities) of the superheated material at the time of ejection of each individual particle. Some of the ejected particles are on the order of 1 μm in diameter and appear as "droplets". Another subgroup appears to have stretched, foam-like structure that can be described as material globules interconnected via smaller in diameter columns. Such particles often contain nanometer size fibers attached on their surface. In other cases, only the globules have been preserved suggesting that they may be associated with a collapsed foam structure under the dynamic pressure as it traverses in air. These distinct features originate in the structure of the superheated material during volume boiling just prior to the ejection of the particles.

Original languageEnglish (US)
Title of host publication47th Annual Laser Damage Symposium Proceedings - Laser-Induced Damage in Optical Materials: 2015
PublisherSPIE
Volume9632
ISBN (Electronic)9781628418323
DOIs
StatePublished - 2015
Externally publishedYes
Event47th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials: 2015 - Boulder, United States
Duration: Sep 27 2015Sep 30 2015

Other

Other47th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials: 2015
CountryUnited States
CityBoulder
Period9/27/159/30/15

Keywords

  • Fused Silica
  • laser superheated material
  • laser-induced damage

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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    Demos, S. G., Negres, R. A., Raman, R. N., Feit, M. D., Manes, K. R., & Rubenchik, A. M. (2015). Morphology of ejected debris from laser super-heated fused silica following exit surface laser-induced damage. In 47th Annual Laser Damage Symposium Proceedings - Laser-Induced Damage in Optical Materials: 2015 (Vol. 9632). [96320S] SPIE. https://doi.org/10.1117/12.2195501