RESEARCH PROGRAM ON NEW PEROVSKITE LASER HOST MATERIALS OF THE A(B'0.5 B''0.5) O3-TYPE HAVING CUBIC CENTROSYMMETRIC LATTICE SITES
Abstract
Powders of perovskite-type compounds having the general formula Ba(B'0.5 Ta0.5)03, where B' is a trivalent rare earth cation, In(3+), Y(3+), or Sc(3+), were doped with trivalent laser activating ions and the fluorescent lifetimes were measured. The values obtained, i.e. 850 micro-sec for Nd(3+) doped Ba(Lu0.5 Ta0.5)03, 800 micro-sec for Nd(3+) doped Ba(Gd0.5 Ta0.5)03, and the long lifetimes obtained for other rare earth doped phases of this type indicate that some of them may make promising laser materials. In addition, the optical properties of a number of other complex perovskite phases and some non- perovskite phases were measured. Studies involving flux growth crystals were also made during this period. In the first investigations, small, discolored crystals of Ba(La0.5 Ta0.5)03, Ba(Gd0.5 Ta0.5)03, Ba(Lu0.5 Ta0.5)03, Ba(Sc0.5 Ta0.5)03 and Ba(Y0.5 Ta0.5)03 were grown from a BaF2 flux. After detailed phase diagram studies of the Ba0YTa04-B2O3 and Ba0-LuTaO4-B2O3 systems, clear single crystals of doped Ba(Y0.5 Ta0.5)O3 and Ba(Lu0.5 Ta0.5)O3 were grown from a B2O3 flux by slow cooling. In addition, a larger single crystal of Ba(Y0.5 Ta0.5)O3 was grown by a modified Czochralski technique.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 30, 1965
- Accession Number
- AD0618936
Entities
People
- D. E. Flinchbaugh
- F. S. Galasso
- G. K. Layden
Organizations
- United Technologies Corporation