Abstract

We demonstrate that appropriately designed doped multimode fibers provide robust single-mode output when used within a fiber laser cavity. Using a novel large-mode-area fiber, we demonstrate what we believe to be record single-mode M2<1.2 pulse energies of >0.5 mJ from a Q-switched fiber laser and even higher pulse energies (as high as 0.85 mJ) with slightly compromised spatial-mode quality M2<2.0. This approach offers significant scope for extending the range of single-mode output powers and energies that are achievable from fiber-laser–amplifier systems.

© 1998 Optical Society of America

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