Disordered laser gain media: Er3+ doped CaGdAlO4 and Ca3Ga2Ge4O14

Jon-Paul R. Wells, Thomas P.J. Han, Mitsuo Yamaga, Nobuhiro Kodama, Hugh G. Gallagher

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We report on the optical spectroscopy of trivalent erbium ions doped into compositionally disordered oxide host materials, CaGdAlO4 and Ca3Ga2Ge3O14. In either material, averaged spectral linewidths of close to 40 cm-1 are measured to be concentration independent up to 5 mol% of the dopant ion. For laser excitation resonant with the 4I15/24F9/2 and 4I13/24F5/2 and 4F3/2 transitions, intense blue and green upconversion fluorescence is observed. Dips in the upconversion excitation spectra are attributable to radiative energy transfer (or self-absorption) which is known to enhance energy storage and upconversion.
Original languageEnglish
Pages (from-to)1093-1095
Number of pages3
JournalJournal of Luminescence
Publication statusPublished - May 2000


  • aluminium compounds
  • calcium compounds
  • colour centre lasers
  • crystal field interactions
  • crystal structure
  • erbium
  • fluorescence
  • gadolinium compounds
  • gallium compounds
  • germanium compounds
  • impurity absorption spectra
  • impurity states
  • multiphoton processes
  • optical pumping
  • radiative transfer
  • visible spectra


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