Diode-pumped acousto-optic Q-switched pulse laser at 1.5–1.6 \mu m is obtained in an Er3+:Yb3+:LuAl3(BO3)4 crystal. Single-pulse laser operation with slope efficiency of 14% and threshold of approximately 100 mW is realized at an average absorbed pump power of 314 mW and repetition frequency of 20 k