High-speed quantitative phase imaging of dynamic thermal deformation in laser irradiated films

Lucas N. Taylor, Andrew K. Brown, Kyle D. Olson, Joseph J. Talghader

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

Abstract

We present a technique for high-speed imaging of the dynamic thermal deformation of transparent substrates under high-power laser irradiation. Traditional thermal sensor arrays are not fast enough to capture thermal decay events. Our system adapts a Mach-Zender interferometer, along with a high-speed camera to capture phase images on sub-millisecond time-scales. These phase images are related to temperature by thermal expansion effects and by the change of refractive index with temperature. High power continuous-wave and long-pulse laser damage often hinges on thermal phenomena rather than the field-induced effects of ultra-short pulse lasers. Our system was able to measure such phenomena. We were able to record 2D videos of 1 ms thermal deformation waves, with 6 frames per wave, from a 100 ns, 10 mJ Q-switched Nd:YAG laser incident on a yttria-coated glass slide. We recorded thermal deformation waves with peak temperatures on the order of 100 degrees Celsius during non-destructive testing.

Original languageEnglish (US)
Title of host publication47th Annual Laser Damage Symposium Proceedings - Laser-Induced Damage in Optical Materials
Subtitle of host publication2015
EditorsM.J. Soileau, Vitaly E. Gruzdev, Joseph A. Menapace, Detlev Ristau, Gregory J. Exarhos
PublisherSPIE
ISBN (Electronic)9781628418323
DOIs
StatePublished - 2015
Event47th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials: 2015 - Boulder, United States
Duration: Sep 27 2015Sep 30 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9632
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

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

Bibliographical note

Publisher Copyright:
© 2015 SPIE.

Keywords

  • Image processing
  • Laser damage
  • Laser damage imaging
  • Thermal imaging

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