Effect of pulsed-laser deposition parameters on plasma expansion studied by fast-framing photography

Dana Miu; Aurelian Marcu; T. Yukawa; Constantin Grigoriu; Ioan Chis; Kiyoshi Yatsui

doi:10.1117/12.312767

2 July 1998 Effect of pulsed-laser deposition parameters on plasma expansion studied by fast-framing photography

Dana Miu, Aurelian Marcu, T. Yukawa, Constantin Grigoriu, Ioan Chis, Kiyoshi Yatsui

Proceedings Volume 3405, ROMOPTO '97: Fifth Conference on Optics; (1998) https://doi.org/10.1117/12.312767
Event: ROMOPTO '97: Fifth Conference on Optics, 1997, Bucharest, Romania

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 YBa₂Cu₃O_7-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.

Citation Download Citation

Dana Miu, Aurelian Marcu, T. Yukawa, Constantin Grigoriu, Ioan Chis, and Kiyoshi Yatsui "Effect of pulsed-laser deposition parameters on plasma expansion studied by fast-framing photography", Proc. SPIE 3405, ROMOPTO '97: Fifth Conference on Optics, (2 July 1998); https://doi.org/10.1117/12.312767

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