Q-Switching of Ytterbium Lasers by A Graphene Saturable Absorber

Yb:YGG, Yb:LuGG and Yb:CNGG lasers are Q-switched by a graphene-based saturable absorber. 190 ns/1.9 μJ pulses are generated at 1045.1 nm using Yb: CNGG and the maximum output power is 440 mW with 24 % slope efficiency.