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Abstract

A new kind of Cr4+ :Ca2GeO4 infrared tunable laser crystals were synthesized by flux growth method with CaCl2 as solvent. The structure of Cr4+ :Ca2GeO4 was characterized by x ray diffraction, Raman spectroscopy (RS) and x ray photoelectron spectroscopy(XPS). The results showed that the obtained crystal was γ-Cr4+ :Ca2GeO4 single crystal with monoclinic structure belonging to olivine structure, and the lattice parameters are: a=5.3209 (1 =0.1 nm), b=6.6648 , c=11.2606 . The result that (GeO4)4- exists in the crystal was verified by RS measurement and its vibration was determined. We can see from the XPS measurement that Cr in the crystal is in the form of Cr4+ and no other valence states exist.

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Vol. 59, Issue 10 - 2010-05-20

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