Polarized absorption spectra and intensities of Er 3+ in sodium beta-double-prime alumina crystals

The polarized absorption spectra and intensities of trivalent erbium in sodium beta-doubleprime alumina (Er:SBA) were investigated between 355 nm and 850 nm. Both sigma ( E ⊥ c-axis) and pi ( E ∥ c-axis) polarized intensity parameters were obtained using a modified Judd-Ofelt phenomenological approa...

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Published inThe Journal of physics and chemistry of solids Vol. 53; no. 9; pp. 1175 - 1184
Main Authors Dai, H., Stafsudd, O.M., Dunn, B., Momoda, L.A.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.1992
Subjects
absorption spectra
Judd-Ofelt analysis
Optical properties
β″-alumina
Judd-Ofelt analysis
β″-alumina
Optical properties
absorption spectra
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Summary:The polarized absorption spectra and intensities of trivalent erbium in sodium beta-doubleprime alumina (Er:SBA) were investigated between 355 nm and 850 nm. Both sigma ( E ⊥ c-axis) and pi ( E ∥ c-axis) polarized intensity parameters were obtained using a modified Judd-Ofelt phenomenological approach. By comparing the concentration dependence of intensity parameters observed in the current system with that observed in Nd:SBA, it is suggested that the observed absorption intensities are mainly contributed by those Er 3+ ions occupying sites which are less sensitive to the symmetry perturbation caused by the residual mobile Na + ions in the conduction plane of the doped crystal. The intensity measurements at different temperatures indicate that the vibronic contribution to the observed intensity is negligible in Er:SBA. An angular dependence of the intensity enhancement in the hypersensitive transitions was also observed.
ISSN:0022-3697
1879-2553
DOI:10.1016/0022-3697(92)90036-D