Abstract
The Yb, Er:YCOB and Yb, Er:CBFB crystals with good optical quality were obtained by the Czochralsky technology. Stark structures of 4I11/2, 4I13/2 and 4I15/2 multiplets of Er3+ - ions are determined, and kinetic and spectroscopic parameters of the crystals are designed by the reciprocity and Fuhtbauer-Ladenburg method. The decreasing of the multiphonon nonradiative relaxation probability from the 4i13/2 level of the erbium with reduction of the contents of oxyboron (BO3) complexes in structure of crystals is observed. The high values of the luminescence quantum output - 20 % for 4I13/2 level and emission cross section on the 1.59 µm wavelength of 0.5 10−20cm2 are designed in CBFB crystals. The effective energy transfer of Yb-Er with quantum efficiency not less than 96 % is found in the YCOB crystals. The nonradiative interaction parameters are determined and equal CYb-Er = 7.6 10−39 and CYb-Yb = 5.1TO−40 cm6s−1. Thus CBFB and YCOB crystals are of great interest for getting of 1.5 mm laser generation.
© 2000 Optical Society of America
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