Abstract
Crystal-field effects are very important as far as laserperformances of Yb-doped materials are concerned. In order tosimplify the interpretation of low-temperature spectra, two toolsderived from a careful examination of crystal-field interaction arepresented. Both approaches are successfully applied in the case ofnew Yb-doped materials, namely Ca3Y2(BO3)4(CYB), Ca3Gd2(BO3)4 (CaGB),Sr3Y(BO3)3 (SrYBO), Ba3Lu(BO3)3(BLuB), Y2SiO5 (YSO), Ca2Al2SiO7 (CAS) andSrY4(SiO4)3O (SYS). The 2F7/2 splitting isparticularly large in these materials and favourable to aquasi-three-level laser operating scheme. Calculations performedusing the point charge electrostatic model for thesecompounds and using a consistent set of effective atomic chargesconfirm the experimental results. This should permit to use thismodel in a predictive approach.
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