Abstract

A femtosecond fiber amplifier with a 26-mm mode-field-diameter erbium-ytterbium-codoped air-clad photonic-crystal fiber is presented. 700-fs pulses at 1557nm were amplified to 7.2-nJ, 120-fs pulses without chirped-pulse amplification. Double-pass configuration enabled perfect single polarization output.

© 2005 Optical Society of America

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