Abstract
The ablation process of high Tc YBa2Cu3O7-x superconducting thin films flashed by a pulsed KrF excimer laser(λ=248nm) or a pulsed Nd-YAG laser (λ=1.06μm) is studied numerically. The dynamics of pulsed nanosecond laser ablation is simulated by the solution of the one-dimensional heat flow equation. The finite element method is applied to solve the equation including the temperature dependence of the thermal conductivity of YBaCuO thin films, the movement of a vapor-liquid interface and the energy of laser-generated plume. The ablation threshold energy density for YBaCuO thin film flashed by a pulsed KrF excimer laser is 0.29J/cm2 and that for a pulsed Nd-YAG laser is estimated to be 0.89J/cm2, and the effect of laser-generated plume energy is discussed.
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