Abstract

We report on what we believe to be the first demonstration of an erbium-ytterbium-doped multifilament-core (MFC) fiber for single-mode amplification of narrow linewidth high peak power pulses. A master-oscillator-power-fiber-amplifier laser source has been demonstrated using a 37-filament MFC fiber in the last amplification stage. Pulses with $750\mu \mathrm{J}$ ($940\mathrm{W}$ peak power) and laser linewidth $<1\mathrm{MHz}$ have beam generated with $M^2\sim 1.3$. This value is close to the theoretical value $M^2\sim 1.5$.

© 2008 Optical Society of America

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