| Autor: |
Kyle D. Olson, Lucas N. Taylor, Joseph J. Talghader, Andrew Brown |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Laser-Induced Damage in Optical Materials: 2015. |
| ISSN: |
0277-786X |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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