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 pulse energies of from a -switched fiber laser and even higher pulse energies (as high as 0.85 mJ) with slightly compromised spatial-mode quality . This approach offers significant scope for extending the range of single-mode output powers and energies that are achievable from fiber-laser–amplifier systems.
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