The spectroscopic and laser properties of mixed fluoride Tm:CaF 2 -SrF 2 crystals were investigated. The 1.9 µm radiation was obtained in two samples with Tm 3+ ion doping concentrations of 1.0 mol% and 2.0 mol% under laser diode pumping at 763 nm. The highest slope efficiency of 32.5% and the widest laser tuning range of 232 nm (1761-1993 nm) were demonstrated with the 1%-doped sample. The maximal output power amplitude of 3.4 W at 1902 nm for an absorbed pump power amplitude of 13.8 W was demonstrated with the 2%doped sample.
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