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- W84060138 abstract "This paper considers two applications of direct laser/materials interaction, laser ablation of superconductor materials and Nd-YAG laser welding. The laser ablation experiments with 355 nm, 10 ns pulses have demonstrated uniform, thin superconductor films. The film uniformity was improved significantly be rotating both the laser target and the film support, and by vertically dithering the laser focus. The film stoichiometry does vary with laser fluence, but it is within 10% of the target material at high fluence. Annealing of the thallium-containing films restores lost oxygen. For the welding application we have investigated the conditions that influence the melt depth. High speed photography has shown the plume to consist of a series of regenerated pulses that move in a direction normal to the surface. The time for plume initiation and the laser power threshold for plume formation are dependent on the substrate material. The plume temperatures depended on the welding atmosphere. Temperatures and melt depths are higher for the reactive gases, air, O/sub 2/, and Sf/sub 6/, than for the nonreactive gases, He, Ar, and N/sub 2/. 18 refs., 13 figs." @default.
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- W84060138 date "1989-01-01" @default.
- W84060138 modified "2023-09-27" @default.
- W84060138 title "Direct laser/materials interaction: Laser ablation of superconductor materials and laser welding" @default.
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