Journal
OPTICAL MATERIALS EXPRESS
Volume 3, Issue 9, Pages 1365-1377Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.3.001365
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Funding
- National Science Foundation Engineering Research Center for Integrated Access Networks [EEC-0812072]
- Photonics Initiative of the University of Arizona (TRIF)
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3 mu m 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 mu m 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 mu s pulses with an energy of 1 mu J 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 mu m wavelength region. (c) 2013 Optical Society of America
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