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Spectroscopic bases of performance enhancement of two-micron lasers by Fe3+ sensitization

The spectroscopic properties of F3+ ions in tetrahedral sites in garnets, together with the good packing of these sites around the dodecahedral position occupied by rare-earth ions, favor a very efficient energy transfer from Fe3+ to TM3+. Since Fe3+ does not introduce additional losses, this ion is a potential sensitizer for Tm3+ laser emission.