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Picosecond pulse amplification in a core-pumped large-mode-area erbium fiber

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Abstract

Amplification in a single-clad, large-mode-area erbium fiber as an alternative to double-clad Er-Yb amplifiers is presented. Both signal and pump are coupled through a mode-matched splice into the fundamental mode, which ensures preferential gain in the fundamental mode while minimizing the amplified spontaneous emission (ASE). The 875μm2 effective area of the Er fiber enables amplification of 6ps pulses at 1.55μm wavelength by 33dB in a single stage to >25kW peak power with low nonlinear pulse distortion and a diffraction-limited output beam with M2<1.1.

© 2007 Optical Society of America

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