Abstract
3 μm Ho3+-doped ZBLAN fiber lasers passively Q-switched by a Fe2+:ZnSe crystal and graphene saturable absorbers were investigated, respectively. 800 ns pulses at 2.93 µm with an energy of 460 nJ and repetition rate of 105 KHz were obtained when a Fe2+:ZnSe crystal was inserted into a free space collimating and focusing setup. A more compact and reliable Q-switched fiber laser was achieved when a graphene coated fiber mirror was butt-coupled to the angle-cleaved end of the gain fiber. 1.2 μs pulses with an energy of 1 μJ and repetition rate of 100 KHz were achieved. More than 100 mW average output power was obtained at the maximum available pump power. Our experiments demonstrate that both Fe2+:ZnSe crystal and graphene are promising saturable absorbers for pulse generation in the 3 µm wavelength region.
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