Abstract
A single-layer graphene saturable absorber is employed for passive Q-switching of an Er, Yb:GdAl3(BO3)4 (Er,Yb:GdAB) compact laser, representing the first Er-doped oxoborate laser Q-switched by graphene. This laser is based on a c-cut 1.8at. % Er3+, 15at. % Yb3+:GdAB crystal diode-pumped at 0.976μm. It generates a maximum average output power of 360mW at 1.55μm with a slope efficiency of 23% (with respect to the incident power). Stable ∼1 μJ/130 ns pulses are achieved at a repetition rate of 400kHz. This result represents, to the best of our knowledge, the shortest pulse duration ever achieved in bulk Er lasers Q-switched by 2D materials. Graphene is a promising material for generating nanosecond pulses at high repetition rates (MHz range) in Er-doped oxoborate lasers emitting in the eye-safe range at 1.5-1.7μm.
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