Spectroscopic properties and orthogonally polarized dual-wavelength laser of Yb3+:NaY(WO4)2 crystals with high Yb3+ concentrations

The optical properties and dual-polarization laser operation of Yb3+:NaY(WO4)2 doped with different concentrations of Yb3+ ions have been detailedly studied in this paper. Single crystals of NaY(WO4)2 doped with 10 at%, 15 at%, 20 at%, 30 at% and 45 at% Yb3+ have been grown by the Czochralski method respectively. By comparing their room temperature polarized absorption and emission cross sections, we found that the 10 at% Yb3+:NaY(WO4) was more appropriate for laser operation. Finally the dual-polarization and dual-wavelength laser properties of 10 at% Yb3+:NaY(WO4) were measured with the output coupler of T = 3%, Rc = 75 mm. An output of 2.33 W of was achieved, which was calculated by 1000 Hz and 0.3 duty ratio pulse, and its slope efficiency is 41.3%. An output of 1.75 W of orthogonally polarized dual-wavelength laser at 1050 nm and 1055 nm was also obtained.