An Investigation of Mechanisms of Initiation of Laser-Supported Absorption (LSA) Waves
Final rept. 23 Apr 73-15 Aug 75
BATTELLE COLUMBUS DIV OH
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This report presents results of experimental effort undertaken in the study of the initiation of laser-supported absorption LSA waves on solid surfaces irradiated in air with pulsed laser radiation. LSA waves may be classified as either supersonic, so-called laser-supported detonation LSD waves, or as subsonic, so-called laser-supported combustion LSC waves. In either case, a hot-air plasma 1-2 eV is formed which propagates back up in the laser beam away from the target surface and absorbs most of the laser-beam energy. The objective of this study was to provide an improved understanding of the process of LSA wave initiation. During the first year of study, experiments were directed toward understanding the mechanisms of initiation of LSD waves produced on practical aluminum surfaces in air with the Battelle 80-joule TEA CO2 laser. During the second year of research, the universality of the electron emission mechanism was investigated in experimental studies of initiation at the 10.6 micrometer wavelength on additional metallic materials having practical surfaces, including tungsten, lead, copper, and zinc.
- Lasers and Masers
- Plasma Physics and Magnetohydrodynamics