Abstract

In recent years, graphene and its compounds (e.g., oxides) have been used as saturable absorbers in passive $Q$-switched and mode-locked lasers, leading to the fabrication of compact pulsed fiber lasers. In this article, we study the operation of a $Q$-switched ytterbium-doped fiber ring laser based on a composite saturable absorber made of graphene oxide and chromium. We show that the addition of a thin layer of chromium can lead to pulse durations ranging from 3.5 to 9.4 μs and subsequently increasing the laser peak power.

© 2014 Optical Society of America

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