CO2 laser beam irradiation was successfully applied to the formation of several intermetailic compound superconductors, e.g., Nb3Al and Nb3Ge.1,2 In the case of Nb3AI, for example, a composite tape of Nb containing powders of Nb and Al is irradiated with a CO2 laser beam of >1 kW. When irradiated, the powders are instantaneously heated and partially melted in the tape moving at a rather high velocity, typically 10 m/min, and very rapidly solidified. This results in the formation of Nb3Al of high stoichiometry. In this process, however, most of the high power emitted is probably reflected at the shiny surface of the Nb sheath. Since both high power and high moving velocity are needed, the process consumes energy and is not controllable. In the present study a new and well controlled process was developed where YAG laser beam irradiation was combined with thin layer formation techniques to produce superconductive tapes of NbC, NbN, Nb3Al, etc.
© 1989 Optical Society of AmericaPDF Article