Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
57 (1985), S. 714-717
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Using a high-energy single-pulse DF laser, a multiple-pulse effect (MPE) occurs for aluminum alloys in air. It requires an incident fluence well above the plasma threshold fluence eT. After a number of exposures, the thermally coupled fluence is almost three times the plasma-enhanced value seen for single pulses above eT. The absorptance below eT at 3.8 μm increases by a factor of 5. We now find that the MPE depends on the presence of O2. New experimental data were taken well above eT in air at low pressures and in gas mixtures at 1 atm with varied O2 content. Plasmas were present but the MPE was not for low O2. The normal single-pulse enhancement was absent without O2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.334716
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