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Graphite saturable absorber based on the pencil-sketching method for Q-switching of an erbium fiber laser

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Abstract

We experimentally demonstrate a practical and simple method for the preparation of a graphite-based, fiberized saturable absorber (SA). Our SA is prepared by using a low-cost graphite-core pencil that is commercially available from stationary stores to uniformly shade the flat end of a fiber ferrule. The saturable-absorption performance of the prepared SA was experimentally tested, and the feasibility of using the SA as a passive Q-switch was investigated through its incorporation into an erbium-doped-fiber ring cavity. The modulation depth of the SA is 1%, and the Q-switched pulses of a 1.98 μs temporal width were readily obtained at a repetition rate of 46.08 kHz.

© 2016 Optical Society of America

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