Czochralski growth and laser operation of Er- and Yb-doped mixed sesquioxide crystals

We report on the Czochralski growth, spectroscopy, and laser operation of Er- and Yb-doped mixed sesquioxide crystals. Er(7 at.%):(Y,Sc) 2 O 3 enables 19% slope efficiency at 2.7 µm, Yb(0.4 at.%):(Y,Sc) 2 O 3 yields 87% at 1.04 µm.