Actions for NANOSECOND INTERFEROMETRIC STUDIES OF SURFACE DEFORMATIONS OF DIELECTRICS INDUCED BY LASER IRRADIATION [electronic resource].

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NANOSECOND INTERFEROMETRIC STUDIES OF SURFACE DEFORMATIONS OF DIELECTRICS INDUCED BY LASER IRRADIATION [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2000.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
12 pages : digital, PDF file
Additional Creators
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Transient surface deformations in dielectric materials induced by laser irradiation were investigated with time-resolved interferometry. Deformation images were acquired at various delay times after exposure to single pulses (100 ps at 1.064 {micro}m) on fresh sample regions. Above the ablation threshold, we observe prompt ejection of material and the formation of a single unipolar compressional surface acoustic wave propagating away from the ablation crater. For calcite, no deformation--either transient or permanent--is discernable at laser fluences below the threshold for material ejection. Above and below-threshold behavior was investigated using a phosphate glass sample with substantial near infrared absorption (Schott filter KG3). Below threshold, KG3 exhibits the formation of a small bulge roughly the size of the laser spot that reaches its maximum amplitude by ≈5 ns. By tens of nanoseconds, the deformations become quite complex and very sensitive to laser fluence. The above-threshold behavior of KG3 combines the ablation-induced surface acoustic wave seen in calcite with the bulge seen below threshold in KG3. A velocity of 2.97 ± 0.03 km/s is measured for the KG3 surface acoustic wave, very close to the Rayleigh wave velocity calculated from material elastic parameters. Details of the transient interferometry system will also be given.
Report Numbers
E 1.99:la-ur-00-2296
la-ur-00-2296
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Note
Published through SciTech Connect.
05/01/2000.
"la-ur-00-2296"
Conference title not supplied, Conference location not supplied, Conference dates not supplied.
ET AL; S. GREENFIELD.
Funding Information
W-7405-ENG-36
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