Accession Number : AD0622338

Title :   RESEARCH ON RARE EARTH FLUORIDE MATERIALS.

Descriptive Note : Interim engineering rept. no. 3, 1 Jun-31 Aug 65,

Corporate Author : HUGHES RESEARCH LABS MALIBU CALIF

Personal Author(s) : Asawa,C. K. ; Devor,D. P. ; Hastings,A. G. , ; Robinson,M. ; stafsudd,O. M.

Report Date : 31 AUG 1965

Pagination or Media Count : 35

Abstract : The work reported is directed toward the selection of those high quality rare earth fluoride materials which indicate the most promising host and dopant combinations, with optimum dopant concentrations, for laser applications. Rare earth materials purified by ion exchange indicated a significant improvement in crystal quality. Single crystals of LaF(3) doped with Tb(3+), Tm(3+), Yb(3+), and Ce(3+), in addition to two new hosts - DyF3 and CeF3, were grown for spectroscopic evaluation. DyF3 will be further investigated as a host sensitizer for Pr(3+). Samples of CeF3:Nd(3+) were prepared for laser testing. Crystals of Er(3+) and Er(3+)-Ce(3+)-doped LaF3 were prepared for further study of the quenching of Er(3+) by Ce(3+); this quenching may be accounted for by ion pair interaction. Theoretical considerations of cross relaxation in double-doped systems are discussed. (Author)

Descriptors :   (*LASERS, CRYSTALS), (*RARE EARTH COMPOUNDS, FLUORIDES), (*FLUORIDES, RARE EARTH COMPOUNDS), CRYSTAL GROWTH, SINGLE CRYSTALS, LANTHANUM COMPOUNDS, ABSORPTION SPECTRA, PRASEODYMIUM COMPOUNDS, DYSPROSIUM COMPOUNDS, CERIUM COMPOUNDS, IMPURITIES, IONS, EUROPIUM, TERBIUM, THULIUM, YTTERBIUM

Distribution Statement : APPROVED FOR PUBLIC RELEASE