Abstract
Raman microprobe spectroscopy measurements show, that in contrast to Er-idiffusion, Er-exchange process leads to significant change of the lattice vibration spectrum of LiNbO3. Therefore, our data allow to assume that the drastic suppression of parasitic upconversion in the Er-exchanged LiNbO3 are caused by multiphonon nonradiative decay of the 2(4F9/2) state, providing fast nonradiative energy transfer to the 4G11/2 and (4F7/2+4I13/2) states. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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