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[摘要]：Sm3+ doped Mg:LiNbO3 and Zn:LiNbO3 are grown by Czochralski method. Optical transmittance and emission spectra are measured and Judd-Ofelt theory is applied to determine phenomenological intensity parameters, oscillator strengths, radiant transition rates, total radiant lifetimes, and branching ratios. The calculations show that Judd-Ofelt parameters with the relation of Omega(4) > Omega(2) > Omega(6) exist, and E Omega(xi)(xi = 2, 4 and 6) in Sm:Zn:LiNbO3 decreases. Fluorescence spectra indicate that visible fluorescence of Sm3+ is made up of 570, 606, 613 and 654 nm emission bands in these crystals under 409 nm excitation. (C) 2011 Elsevier B.V. All rights reserved. |
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