Yb3+,Li+ -codoped monoclinic zinc tungstate (ZnWO4) crystals with optimized Li+ content providing efficient local charge compensation were grown by the Czochralski method. Heavy Li+ codoping makes the Yb3+-doped ZnWO4 crystals less prone to cracking, improves the Yb3+ segregation, reduces the melting point and induces inhomogeneous spectral line broadening. The polarized absorption and stimulated-emission cross-sections of Yb3+ in ZnWO4 were determined. The maximum stimulated-emission cross-section σSE is 2.94×10-20 cm2 at 1055.5 nm corresponding to an emission bandwidth of 12.2 nm for light polarization E || Np. The formation of Yb3+ optical centers in singly Yb3+-doped and Yb3+,Li+ -codoped zinc monotungstate crystals is revealed by low-temperature spectroscopy. The Yb,Li:ZnWO4 laser pumped by a commercial 976-nm Yb-fiber laser generated 2.41 W at approximately 1.06 μm with a slope efficiency of 76.4%, a laser threshold of 143 mW and linear polarization.
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