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Opt Lett. 2008 Nov 15;33(22):2701-3.

Multifilament-core fibers for high energy pulse amplification at 1.5 microm with excellent beam quality.

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Office National d'Etudes et de Recherches Aérospatiales, Département d'Optique Théorique et Appliquée, Chemin de la Hunière, Palaiseau, France.


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 microJ (940 W peak power) and laser linewidth<1 MHz have beam generated with M2 approximately 1.3. This value is close to the theoretical value M2 approximately 1.5.

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