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Characteristics of a Q-switched multicore photonic crystal fiber laser with a very large mode field area

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Abstract

We model and characterize the behavior of a Q-switched fiber laser. The fiber is a doped multicore photonic crystal fiber having six cores in a ring-type geometry. The fiber laser is Q-switched using an intracavity acousto-optic modulator. Using a mode filtering technique in the far field, a mode very close to the fundamental in-phase supermode is obtained with a mode field area of 4200μm2 and a divergence of 9mrad. Pulses with energies of up to 2.2mJ and durations of 26ns (limited by end facet damage) at a repetition rate of 10kHz are obtained.

© 2007 Optical Society of America

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