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Tm-doped monoclinic double tungstate crystals, KRE(WO4)2 or shortly KREW, are suitable for efficient multi-watt thin-disk lasers emitting at ∼1.9 μm [1] due to the high available doping levels and high transition cross-sections of the Tm3+ ions. Holmium (Ho3+) ions are attractive for laser emission above 2 μm due to the 5I6 ↔5I8 transition which is of interest for medical applications. KREW crystals...
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