ФТТ, 2008, том 50, выпуск 9

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Direct calculation of transition intensities in LiYF4 : Nd3+

JinsuZhang *,**, JiahuaZhang *, FengLiu ***, Xiao-junWang *,****

* Key Laboratory of Excited State Processes, Changchun Institute of Optics,
Fine Mechanics and Physics, Chinese Academy of Sciences,
130033 Changchun, China
** Graduate School, Chinese Academy of Sciences,
100039, Beijing, China
*** Department of Physics and Astronomy, University of Georgia,
GA 30602 Athens, USA
**** Department of Physics, Georgia Southern University,
GA 30460 Statesboro, USA
E-mail: zjiahua@public.cc.jl.cn, xwang@georgiasouthern.edu

We will extend Duan's simple model to analyze the mixing of the 4fN-15d-configuration with the 4fN-states. We consider the explicit static coupling and traditional dynamic coupling, and fit the parameters according to the absorption spectrum in LiYF4 : Nd3+. The parameters obtained are T32=-28i·10-7, T52=-1151i·10-7, A232=192i·10-12 cm, A452=i·10-12 cm, A672=54i·10-12 cm and A676=-680i·10-12 cm. Compared to the experimental measurements, the present model yields better results than whose obtained from the Judd--Ofelt theory.

This work is financially supported by the MOST of China (2006CB601104, 2006AA03A138) and the National Nature Science Foundation of China (10574128, 10504031).

PACS: 71.15.Qe, 71.20.Eh, 71.70.Ch, 78.20.Bh

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