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Crystal-field analysis for RE3+ ions in laser materials: II. Absorption spectra and energy levels calculations for Nd3+ions doped into SrLaGa3O7 and BaLaGa3O7 crystals and Tm3+ ions in SrGdGa3O7.
Autorzy
Rok wydania
2011
Czasopismo
Numer woluminu
387
Strony
69-78
DOI
10.1016/j.chemphys.2011.06.036
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Low temperature polarized absorption spectra are analyzed to achieve assignments of energy levels for Nd3+ and Tm3+ ions at monoclinic Cs site symmetry in ABC(3)O(7) crystals. Based on the concept of average optical center, the experimental energy levels for single crystals of SrLaGa3O7:Nd3+ (SLG:Nd), BaLaGa3O7:Nd3+ (BLG:Nd), and SrGdGa3O7:Tm3+ (SGG:Tm) were analyzed in terms of the free-ion parameters and the crystal field (CF) ones, B-kq. Assignments of the energy levels resolved in the spectra were done in stages applying the ascent/descent in symmetry method in CF analysis. The actual monoclinic C-s site symmetry at the metal centers in ABC(3)O(7) crystals and the approximated orthorhombic C-2v and tetragonal C-4v symmetry were considered. The starting values of B-kq's for SLG:Nd and BLG:Nd crystals were obtained from superposition model (SPM) analysis. The final fitted crystal field parameters show high compatibility with the existing data for structurally similar ion-host systems. The obtained values of the intrinsic parameters provide basis for SPM analysis of CF parameters for rare earth ions in other similar systems, especially those exhibiting low-symmetry sites. The SPM parameters derived for SLG:Nd are used for simulation and assignment of the energy levels involved in the potential laser transitions at about 1800 nm due to Tm3+ ions in SGG crystals. The evaluated emission cross-section is about two times lower than that obtained previously.
Słowa kluczowe
Optical spectroscopy, Crystal (ligand) field parameters, Monoclinic, orthorhombic and tetragonal site symmetry, Nd3+ and Tm3+ ions, SrLaGa3O7:Nd3+, BaLaGa3O7:Nd3+, SrGdGa3O7:Tm3+
Adres publiczny
http://dx.doi.org/ 10.1016/j.chemphys.2011.06.036
Strona internetowa wydawcy
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