Accession Number : AD0649831

Title :   RESEARCH OF SENSITIZED FLUORESCENCE OF RARE EARTH IONS IN CRYSTALS.

Descriptive Note : Progress rept., May-Dec 66,

Corporate Author : WESTINGHOUSE RESEARCH LABS PITTSBURGH PA

Personal Author(s) : Ohlmann,R. C. ; Melamed,N. T. ; Mazelsky,R. ; Kramer,W. E.

Report Date : DEC 1966

Pagination or Media Count : 67

Abstract : The fluorescence of the rare-earth ions, Eu(3+), Nd(3+), Ho(3+), and Tm(3+) in the host materials Y3Al5O12, Ca5(PO4)3F, YAlO3, GdAlO3 are reported along with the excitation in some cases. These data are used to estimate which ions may be sensitized with transition-metal ions in crystals and will lead to low threshold, high efficiency crystalline lasers. It was found that the rare-earth ions in Ca5(PO4)3F and Y3Al5O12 gave fluorescence lines having more narrow spectral widths than in GdAlO3 and YAlO3. The former two are therefore better materials to choose to sensitize to further improve their laser characteristics. The study of the spectra of manganese, vanadium and titanium in Ca5(PO4)3F indicates that Mn(2+) and (MnO4)(3-) show the most promise as being sensitizers of the rare-earth ions in this host. Initial study of the sensitization of the rare-earth ions has not yet led to any positive results. Attempts to dope Y3Al5O12 with ruthenium were unsuccessful indicating ruthenium is probably not a likely candidate for doping the refractory oxides. (Author)

Descriptors :   (*LASERS, MATERIALS), (*CRYSTALS, FLUORESCENCE), (*RARE EARTH ELEMENTS, *FLUORESCENCE), GARNET, YTTRIUM COMPOUNDS, ALUMINATES, CALCIUM COMPOUNDS, PHOSPHATES, FLUORIDES, EUROPIUM, NEODYMIUM, HOLMIUM, THULIUM, IONS, TRANSITION METALS, MANGANESE, VANADIUM, TITANIUM, RUTHENIUM, DOPING

Subject Categories : Lasers and Masers
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE