Abstract

We demonstrate a nanosecond-pulse erbium-doped fiber laser that is passively mode locked by a hollow-core photonic crystal fiber filled with few-layered graphene oxide solution. Owing to the good solution processing capability of few-layered graphene oxide, which can be filled into the core of a hollow-core photonic crystal fiber through a selective hole filling process, a graphene saturable absorber can be successfully fabricated. The output pulses obtained have a center wavelength, pulse width, and repetition rate of 1561.2โ€‰nm, 4.85โ€‰ns, and 7.68โ€‰MHz, respectively. This method provides a simple and efficient approach to integrate the graphene into the optical fiber system.

© 2011 Optical Society of America

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