Lasing on the 4I13/2 → 4I15/2 transition of Er3+ ions in ZrO2 – Y2O3 – Er2O3 crystals under resonant diode pumping into the 4I13/2 level

Experimental results on lasing in ZrO₂ – Y₂O₃ – Er₂O₃ crystals are presented. Under diode pumping of ZrO₂ – Y₂O₃ (13.8 mol %) – Er₂O₃ (0.2 mol %) crystals into the ⁴I_13/2 level of Er³⁺ ions, lasing is obtained at the ⁴I_13/2 → ⁴I_15/2 transition with a wavelength of 1648 nm.