Abstract
The pure Ca9La(VO4)7 and the Nd:Ca9La(VO4)7 crystals with various Nd3+-doped concentrations were grown by Czochraski method. The effective segregation coefficient of Nd3+ ion in Ca9La(VO4)7 crystal was measured as 1.07, which is favorable to the even distribution of Nd3+ ions. The frequency-doubling experiment and the crystal structure analyses show that the presence of La3+ ion in crystal can improve the SHG effect of Ca9La(VO4)7 crystal. The intensity of SHG effect, measured by the Kurtz powder method, is found to be about 4 times as large as that of KH2PO4 (KDP) crystal. The polarized absorption spectra and the polarized fluorescence spectra are analyzed based on Judd–Ofelt theory, which show that the Nd:Ca9La(VO4)7 crystal is hopeful to generate laser light at the wavelengths of about 921, 1069 and 1349nm. The luminescence decay kinetics are analyzed based on the migration model, and the results indicate that Nd3+ ion in Ca9La(VO4)7 crystal has a high quantum efficiency, about 98.2% in 3.2at.% Nd:Ca9La(VO4)7 crystal, and a weak concentration quenching effect. Therefore, Nd:Ca9La(VO4)7 crystal may be a high efficiency laser material and a candidate of self-frequency-doubling (SFD) laser crystal.
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