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SYMMETRICAL LASER CRYSTALS
UNION CARBIDE CORP INDIANAPOLIS IN LINDE DIV
Cubic perovskites should be desirable host crystals for laser dopant ions. A longer fluorescent lifetime is anticipated when the dopant is at a center of symmetry. Only four II-IV perovskite oxides proved to be cubic they are SrTiO3, SrSnO3, BaSnO3 and BaZrO3. BaZrO3 is predicted to be the best choice for doping with divalent rare-earth ions because the zirconium compound is more stable toward reduction. The synthesis of both SrTiO3 and BaZrO3 was investigated in this program. A self-containment or skull-melting method was developed for fusing and maintaining melts of SrTiO3 and BaZrO3. The problems inherent in skull-melting were studied both theoretically and experimentally. Stable melts of as much as 3 kg of both compounds have been made and controlled. Pulling experiments with SrTiO3 demonstrated that the basic operations of the Czochralski method may be performed with skull-melts. Polycrystalline masses of SrTiO3 were pulled after nucleation on an iridium rod.
Semiannual technical summary rept. for 1 May-31 Dec 1964
Sponsored in part by the DARPA. DOI: 10.21236/AD0610608
Approved for public release; distribution is unlimited.