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Monoclinic Yb3+,Li+:ZnWO4 crystals were grown by Czochralski and their structure is refined. The spectroscopic properties of Yb3+ ions were studied with polarized light and the scheme of Stark splitting of Yb3+ manifolds in these crystals was determined. The Raman spectra were measured. A diode-pumped 2.90 W laser action at 1059 nm in the crystals was demonstrated