Спектрально-люминесцентные свойства кристаллов иттрий-магниевого пентабората, легированных ионами Er 3+ и Yb 3+

The spectral-luminescent properties of Er 3+ ,Yb 3+ :YMgB 5 O 10 were investigated. The spectra of the crosssection of absorption and stimulated emission in polarized light were determined. The lifetimes of the erbuim 4 I 13/2 and ytterbium 2 F 5/2 energy levels were measured. The Yb 3+ →Er 3+ energy transfer efficiency was estimated. Within the framework of the conventional Judd-Ofelt theory the strengths of absorption and emission transitions were calculated, which gave an opportunity to determine the lifetime of the Er 3+ excited energy levels as well as the luminescence branching ratios.