Accession Number : AD0833252

Title :   SENSITIZED FLUORESCENCE OF RARE EARTH IONS IN CRYSTALS.

Descriptive Note : Final technical summary rept. 16 May 66-15 May 67,

Corporate Author : WESTINGHOUSE RESEARCH LABS PITTSBURGH PA

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

Report Date : JUL 1967

Pagination or Media Count : 146

Abstract : In order to improve the efficiency of optically pumped crystalline laser materials, a search was conducted to discover combinations of crystalline hosts, rare earth ions, and transition metal ions in which the transition metal ions are able to absorb radiation from a pump lamp over a large spectral range and then transfer this energy to rare earth ions which fluoresce and are capable of stimulated emission. Attempts were made to sensitize the rare earth ions neodymium, holmium, thulium, and europium in the crystalline hosts yttrium aluminum garnet (YAG), calcium fluorophosphate (FAP), and gadolinium aluminum perovskite (GdAlO3). Neodymium was successfully sensitized in YAG by chromium, vanadium, and manganese. No significant sensitization of neodymium was found in FAP. Europium was not able to be sensitized in any of the crystals. Holmium and thulium are sensitized by trivalent chromium in YAG, and by higher valence state of chromium in FAP. The laser efficiency of FAP crystals doped with holmium and chromium is predicted to be high since radiation is totally absorbed from 0.5 to 1.4 microns and the energy is transferred to holmium ions. (Author)

Descriptors :   (*RARE EARTH ELEMENTS, FLUORESCENCE), LASERS, IONS, CRYSTALS, METALS, TRANSITION METALS, NEODYMIUM, HOLMIUM, THULIUM, EUROPIUM, YTTRIUM, GADOLINIUM, ALUMINUM, GARNET, DOPING, ABSORPTION, EXCITATION, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, INFRARED SPECTRA.

Subject Categories : Lasers and Masers
      Crystallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE