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Proceedings Paper

High-speed quantitative phase imaging of dynamic thermal deformation in laser irradiated films
Author(s): Lucas N. Taylor; Andrew K. Brown; Kyle D. Olson; Joseph J. Talghader
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Paper 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.

Paper Details

Date Published: 23 November 2015
PDF: 8 pages
Proc. SPIE 9632, Laser-Induced Damage in Optical Materials: 2015, 963214 (23 November 2015); doi: 10.1117/12.2195107
Show Author Affiliations
Lucas N. Taylor, Univ. of Minnesota, Twin Cities (United States)
Andrew K. Brown, Univ. of Minnesota, Twin Cities (United States)
Kyle D. Olson, Univ. of Minnesota, Twin Cities (United States)
Joseph J. Talghader, Univ. of Minnesota, Twin Cities (United States)

Published in SPIE Proceedings Vol. 9632:
Laser-Induced Damage in Optical Materials: 2015
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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