Accession Number:

AD0610608

Title:

SYMMETRICAL LASER CRYSTALS

Descriptive Note:

Semiannual technical summary rept. for 1 May-31 Dec 1964

Corporate Author:

UNION CARBIDE CORP INDIANAPOLIS IN LINDE DIV

Personal Author(s):

• Fay, H.
• Brandle, C. D.
• Nestor, O. H.

Report Date:

1965-01-28

Pagination or Media Count:

72.0

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.

Descriptors:

• *CRYSTAL GROWTH
• BARIUM COMPOUNDS
• CRYSTAL STRUCTURE
• IMPURITIES
• LASERS
• LUMINESCENCE
• MATERIALS
• MELTING
• STANNATES
• STRONTIUM COMPOUNDS
• SYMMETRY(CRYSTALLOGRAPHY)
• TITANATES
• ZIRCONATES

Subject Categories:

• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE