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The efficient 1 μm Yb3+ luminescence was found in Scheelite-like molybdate and tungstate crystals at UV-excitation. The presentation is devoted to discussion about the nature of optical donor centres in the crystals, which absorb the UV excitation and non-radiatively transfer their excited state energy to the 2F5/2 excited state of Yb3+ ions.
The evolution of Cr4+, Cr3+ and Cr2+ contents in Cr:Mg2SiO4 crystals during those prolonged high-temperature oxidizing annealing have been studied. The concentration of Cr4+ increases by factor of 1, 5-2, 5, whereas the parasitic Cr2+ ions practically disappear during such annealing. Therefore this post-growth treatment of Cr:Mg2SiO4 crystals considerably enhances their spectroscopic properties as...
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