Abstract

Magnesium diboride (${\mathrm{MgB}}_2$) is a well-known superconductor at temperatures below 39 K. At higher temperatures, it behaves as a lossy material. In this paper, we examine the performance of ${\mathrm{MgB}}_2$ 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 1700 ns. 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 ${\mathrm{MgB}}_2$ is used as a saturable absorber in a $Q$-switched laser.

© 2017 Optical Society of America

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