Abstract
Absorption, luminescence and absorption saturation of Cr ions in a calcium aluminate glass are studied. In the absorption spectrum, the absorption bands of Cr3+, Cr4+ and Cr6+ ions are revealed. The emission spectrum presents luminescence of Cr3+ ions centered at 0.82μm and that of Cr4+ ions at 1.3μm. The luminescence signal demonstrates short decay times of 120±10ns and 300±20ns for Cr3+ and Cr4+ ions, respectively. Absorption saturation measurements allowed an estimate of the ground-state absorption cross-sections for Cr4+ ions at 1.06μm of 0.7×10−18cm2 and at 0.69μm of 1.5×10−18cm2.
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