SK

S. Kars

3 records found

The interaction of a spatially uniform 248 nm excimer laser beam with targets of various oxides (YBa2Cu3O7 − δ, Y2BaCuO5, Y2O3 and SrTiO3) is investigated. We identify two different mechanisms for non-stoichiometric ablation. Evidence is found that in YBa2Cu3O7 − δ and Y2BaCuO5 t ...
Projection optics is a means to reduce the spatial energy density variations on the target during laser ablation. Using projection optics to study the interaction between a spatially uniform 248 nm excimer laser beam and a YBa2Cu3O6+x target we observe a well-defined threshold fl ...
Using projection optics we made a detailed study of the interaction of a spatially uniform 248 nm excimer laser beam and a 99% dense YBa 2Cu3O6+x target. Below a threshold fluence of 1 J/cm2 the roughness of the irradiated target increases dramatically due to non-stoichiometric a ...