Imaging the early material response associated with exit surface damage in fused silica

Stavros G. Demos, Rajesh N. Raman, Raluca A. Negres

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

1 Citation (Scopus)

Abstract

The processes involved at the onset of damage initiation on the surface of fused silica have been a topic of extensive discussion and thought for more than four decades. Limited experimental results have helped develop models covering specific aspects of the process. In this work we present the results of an experimental study aiming at imaging the material response from the onset of the observation of material modification during exposure to the laser pulse through the time point at which material ejection begins. The system involves damage initiation using a 355 nm pulse, 7.8 ns FWHM in duration and imaging of the affected material volume with spatial resolution on the order of 1 μm using as strobe light a 150 ps laser pulse that is appropriately timed with respect to the pump pulse. The observations reveal that the onset of material modification is associated with regions of increased absorption, i.e., formation of an electronic excitation, leading to a reduction in the probe transmission to only a few percent within a time interval of about 1 ns. This area is subsequently rapidly expanding with a speed of about 1.2 μm/ns and is accompanied by the formation and propagation of radial cracks. These cracks appear to initiate about 2 ns after the start of the expansion of the modified region. The damage sites continue to grow for about 25 ns but the mechanism of expansion after the termination of the laser pulse is via formation and propagation of lateral cracks. During this time, the affected area of the surface appears to expand forming a bulge of about 40 μm in height. The first clear observation of material cluster ejection is noted at about 50 ns delay.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7842
DOIs
StatePublished - 2010
Externally publishedYes
Event42nd Annual Laser Damage Symposium Proceedings - Laser-Induced Damage in Optical Materials: 2010 - Boulder, CO, United States
Duration: Sep 26 2010Sep 29 2010

Other

Other42nd Annual Laser Damage Symposium Proceedings - Laser-Induced Damage in Optical Materials: 2010
CountryUnited States
CityBoulder, CO
Period9/26/109/29/10

Fingerprint

Fused Silica
Fused silica
Damage
Imaging
silicon dioxide
damage
Imaging techniques
pulses
cracks
Laser pulses
Crack
ejection
Laser
Cracks
lasers
expansion
propagation
Propagation
Full width at half maximum
coverings

Keywords

  • damage growth
  • fused silica
  • microscopy
  • surface damage initiation
  • Time-resolved imaging

ASJC Scopus subject areas

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

Cite this

Demos, S. G., Raman, R. N., & Negres, R. A. (2010). Imaging the early material response associated with exit surface damage in fused silica. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7842). [78420M] https://doi.org/10.1117/12.867724

Imaging the early material response associated with exit surface damage in fused silica. / Demos, Stavros G.; Raman, Rajesh N.; Negres, Raluca A.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7842 2010. 78420M.

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

Demos, SG, Raman, RN & Negres, RA 2010, Imaging the early material response associated with exit surface damage in fused silica. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7842, 78420M, 42nd Annual Laser Damage Symposium Proceedings - Laser-Induced Damage in Optical Materials: 2010, Boulder, CO, United States, 9/26/10. https://doi.org/10.1117/12.867724
Demos SG, Raman RN, Negres RA. Imaging the early material response associated with exit surface damage in fused silica. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7842. 2010. 78420M https://doi.org/10.1117/12.867724
Demos, Stavros G. ; Raman, Rajesh N. ; Negres, Raluca A. / Imaging the early material response associated with exit surface damage in fused silica. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7842 2010.
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