Abstract
K5Nd(MoO4)4 crystals with different Yb3+ concentrations were grown using Czochralski technique. Room-temperature absorption spectra were recorded and assigned on the basis of Dieke's diagram for Nd3+ ion; the standard Judd–Ofelt theory has been used to analyze the spectra. Increase of Yb3+ concentration leads to variation of the corresponding Judd–Ofelt intensity parameters. Significant contribution of the Yb↔Nd energy transfer into the formation of the Nd3+ absorption spectra causes the observed changes. After illumination of the crystals with CW Nd:YAG laser changes of the birefringence for the laser line of CW He–Ne laser at 633nm were studied. Birefringence changes show good correlation with the content of Yb ions.
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