Diffraction-Limited Fundamental Mode Operation of Core-Pumped Very-Large-Mode-Area Er Fiber Amplifiers

Diffraction-limited fundamental mode amplification is demonstrated in Er-doped fibers with mode areas ranging from 900 to 1800 mum 2 . The amplifiers are core-pumped with Raman fiber lasers with both signal and pump selectively launched into the fundamental mode. This scheme results in differential...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics 2009-01, Vol.15 (1), p.3-11
Main Authors: Jasapara, J.C., Andrejco, M.J., DeSantolo, A., Yablon, A.D., Vrallyay, Z., Nicholson, J.W., Fini, J.M., DiGiovanni, D.J., Headley, C., Monberg, E., DiMarcello, F.V.
Format: Article
Language:English
Subjects:
Amplification
Amplifiers
Core pumping
Differential amplifiers
differential gain
Diffraction
Er fiber amplifier
Erbium
Fiber lasers
Fibers
Gain
large-mode-area fiber
Laser excitation
Laser modes
Noise levels
Operational amplifiers
picosecond pulse amplification
Pulse amplifiers
Pump lasers
Pumps
Raman laser
Spontaneous emission
Stimulated emission
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Summary:Diffraction-limited fundamental mode amplification is demonstrated in Er-doped fibers with mode areas ranging from 900 to 1800 mum 2 . The amplifiers are core-pumped with Raman fiber lasers with both signal and pump selectively launched into the fundamental mode. This scheme results in differential gain for the fundamental mode and stabilizes it against mode mixing caused by perturbations in the core. Gains that are greater than 30 dB are demonstrated from a single stage without significant amplified spontaneous emission. The low nonlinearity of the large mode areas enables amplification to high peak powers without resorting to unconventional microstructured or higher order mode fibers.
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2008.2010262