E. Antic-Fidancev

Spectroscopic and crystal-field analysis of new Yb-doped laser materials

Crystal-field effects are very important as far as laser performances of Yb-doped materials are concerned. In order to simplify the interpretation of low-temperature spectra, two tools derived from a careful examination of crystal-field interaction are presented. Both approaches are successfully applied in the case of new Yb-doped materials, namely Ca3Y2(BO3)4 (CYB), Ca3Gd2(BO3)4 (CaGB), Sr3Y(BO3)3 (SrYBO), Ba3Lu(BO3)3 (BLuB), Y2SiO5 (YSO), Ca2Al2SiO7 (CAS) and SrY4(SiO4)3O (SYS). The 2F7/2 splitting is particularly large in these materials and favourable to a quasi-three-level laser operating scheme. Calculations performed using the point charge electrostatic model for these compounds and using a consistent set of effective atomic charges confirm the experimental results. This should permit to use this model in a predictive approach.

The crystal field strength parameter and the maximum splitting of the 7F1 manifold of the Eu3+ ion in oxides

Departamento de Quimica Geral e Inorĝanica Instituto de Quimica UNESP, Rua Prof. Francisco Degni, S/N, Araraquara, 14800-900 SP

Crystal field strength in C-type cubic rare earth oxides

Abstract Luminescence of the Eu 3+ -doped cubic C-type rare earth (RE) oxides, RE 2 O 3 :Eu 3+ (RE=Eu, Gd, Lu, Y, In and Sc) powder samples at 77 and 298 K was investigated under UV, argon ion and dye laser excitation. Intense transitions from the 5 D 0 to 7 F 0–4 levels of the ground 7 F multiplet were observed between 575 and 720 nm. The complete lifting of the 7 F J level degeneracy as well as the absence of transition selection rules imposed by the group theory are consistent with the C 2 point symmetry of the RE 3+ site. Only a few lines originating from Eu 3+ ions in the high symmetry S 6 site were observed. The crystal field (c.f.) analysis conducted on the basis of the 18–21 7 F 0–4 c.f. levels yielded satisfactory results despite the high number (14) of the B k q and S k q parameters. The strength of the c.f. effect increases in the RE series with decreasing ionic radius of the RE 3+ host cation. This results from the increased electrostatic effect of the host lattice on the Eu 3+ ion.

Simple way to test the validity of 2S+1LJ barycenters of rare earth ions (e.g. 4f2, 4f3 and 4f6 configurations)

Abstract The energy displacement of non-degenerated electronic 2 S +1 L J levels, ( J =0 or 1/2), along the nephelauxetic scale of a rare earth ion can be easily connected with the evolution of the barycenter position of different 2 S +1 L J levels of 4f n ground configurations. Linear slopes are obtained and presented for different crystal field (cf) levels for Nd 3+ , Pr 3+ and Eu 3+ , corresponding to the 4f 2 , 4f 3 and 4f 6 configurations, respectively. A 2 S +1 L J level barycenter positioned out of slope suggests incorrect assignment of the level. Moreover, some missing Stark components of a given 2 S +1 L J level can be correctly extrapolated on the basis of the corresponding barycenter deduced from the slope. It is particularly evident in the case of low J values. The example of the 2 P 3/2 level for Nd 3+ doped Ca 4 GdO(BO 3 ) 3 (GdCOB) crystal is given as an illustration.

Optical spectra, crystal-field parameters, and magnetic susceptibility of multiferroic Nd Fe 3 ( B O 3 ) 4

We report high-resolution optical absorption spectra for

Simulation of the energy level scheme of Nd3+ and Eu3+ ions in rare-earth orthovanadates and phosphates

\mathrm{Nd}{\mathrm{Fe}}_{3}{(\mathrm{B}{\mathrm{O}}_{3})}_{4}

Crystal field energy levels of Eu3+ and Yb3+ in the C2 and S6 sites of the cubic C-type R2 O3

trigonal single crystal, which is known to exhibit a giant magnetoelectric effect below the temperature of magnetic ordering

Eu3+- and Tm3+-doped yttrium oxide thin films for optical applications

{T}_{N}=33\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Optical spectra and crystal field calculations of doped Zircon-type laser hosts (, P, As)

. The analysis of the temperature-dependent polarized spectra reveals the energies and, in some cases, symmetries and exchange splittings of

High-resolution infrared absorption spectra, crystal-field levels, and relaxation processes inCsCdBr3:Pr3+

{\mathrm{Nd}}^{3+}