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Proceedings Paper

Effect of pulsed-laser deposition parameters on plasma expansion studied by fast-framing photography
Author(s): Dana Miu; Aurelian Marcu; T. Yukawa; Constantin Grigoriu; Ioan Chis; Kiyoshi Yatsui
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Paper Abstract

Fast-framing photography was used to study the effect of various parameters on the expansion of the visible plasma plume produced by KrF laser irradiation of a YBa2Cu3O7-x target. The ambient gas pressure has a considerable effect on the evolution and structure of the plasma. In vacuum, the visible emission is strongly forward-directed and has a relatively short duration. In the presence of an oxygen atmosphere, a long-lived, highly luminous front is formed, whose expansion may be well described by a drag model or a shock model (spherical or plane shock). Ahead of the luminous front there is weak emission, which for pressures over about 700 mTorr evolves into a highly emissive `tip'. The decrease of energy density on the target by increase of the laser spot (defocusing) leads to a more forward-directed motion of the visible species. Larger energy densities obtained by increasing the energy/pulse lead to a sharper, `V' shaped front. The effect of a biased ring electrode placed 0.5 cm to 2 cm in front of the target was also studied. The emission characteristics in the electrode's presence change greatly. The effect of ring-target distance, voltage magnitude and polarity, and pressure were observed.

Paper Details

Date Published: 2 July 1998
PDF: 6 pages
Proc. SPIE 3405, ROMOPTO '97: Fifth Conference on Optics, (2 July 1998);
Show Author Affiliations
Dana Miu, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Aurelian Marcu, National Institute for Laser, Plasma, and Radiation Physics (Romania)
T. Yukawa, Nagaoka Univ. of Technology (Japan)
Constantin Grigoriu, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Ioan Chis, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Kiyoshi Yatsui, Nagaoka Univ. of Technology (Japan)

Published in SPIE Proceedings Vol. 3405:
ROMOPTO '97: Fifth Conference on Optics
Valentin I. Vlad; Dan C. Dumitras, Editor(s)

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