Abstract
Magnesium diboride (MgB2) is a well-known superconductor at temperatures below 39K. At higher temperatures, it behaves as a lossy material. In this paper, we examine the performance of MgB2 nano-particles as saturable absorber in a ytterbium-doped fiber ring laser at room temperature: we show that the nano-particles can produce pulses between 200 and 1700ns. The dynamics of the saturable absorber are both examined as a stand-alone saturable absorber and in combination with an acousto-optic modulator. We believe, to the best of our knowledge, that this is the first time that MgB2 is used as a saturable absorber in a Q-switched laser.
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