SYMMETRICAL LASER CRYSTALS
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 28, 1965
- Accession Number
- AD0610608
Entities
People
- C. D. Brandle
- H. Fay
- O. H. Nestor