Monoclinic KY(WO
4)
2:Pr
3+, Tm
3+:KY(WO
4)
2:Er
3+,Yb
3+ single crystals are grown by low-gradient Czochralski technique. Stimulated emission at 1.0223 μm wavelength in the new lasing
1D
2→
3F
3 channel of Pr
3+ ions in KY(WO
4)
2 at room temperature under Xe-flashlamp pumping is excited. Full sets of Stark-level energies for Pr
3+ ions in KY(WO
4)
2 and KGd(WO
4)
2 crystals at 77 K are determined. 4f
2-4f
2 intensity-transitions for the KY(WO
4)
2:Pr
3+ are analyzed preliminarily. All observed at present and earlier one-micron Pr
3+-ion, induced transitions in the
1D
2→
3F
3 and
1D
2→
3F
4 channels are identified. In yttrium and gadolinium sensitized-tungstates a two-micron (
3H
4→
3H
6) low-threshold generation of Tm
3+ ions at cryogenic temperatures is achieved.
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