Crystal growth and spectroscopic studies of novel Yb-doped K_5Nd(MoO_4)_4 single crystals

摘要

K_5Nd(MoO_4)_4 crystals with different Yb~(3+) concentrations were grown using Czochralski technique. Room-temperature absorption spectra were recorded and assigned on the basis of Dieke's diagram for Nd~(3+) ion; the standard Judd-Ofelt theory has been used to analyze the spectra. Increase of Yb~(3+) concentration leads to variation of the corresponding Judd-Ofelt intensity parameters. Significant contribution of the Yb?Nd energy transfer into the formation of the Nd~(3+) 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 633 nm were studied. Birefringence changes show good correlation with the content of Yb ions.