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Proceedings Paper

Forward and backward seeded continuous-wave Raman fiber amplifiers based on multimode fibers
Author(s): Nathan B. Terry; Kevin Engel; Thomas G. Alley; Timothy H. Russell; Won B. Roh
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Paper Abstract

We report on the performance of seeded Raman fiber amplifiers based on multimode gradient index fiber. The "beam cleanup" improvement in beam quality of the Stokes beam over that of input pump beam (previously observed in unseeded fiber amplifier geometries using stimulated Raman scattering in multimode graded index fiber) is shown here to be limited by the beam quality of the input seed beam for seeded amplifier configurations. The amplifiers are characterized in terms of their capacity for beam-cleanup, their ability to amplify the seed and in terms of their output spectra. The advantages and disadvantages of a backward-pumped geometry versus a forward-pumped geometry are discussed. Depending on the geometry, amplified power can be readily distributed to a cascade of Stokes frequencies (unseeded forward-pumped geometry) or can be mostly contained in the seed frequency (seeded backward-pumped geometry).

Paper Details

Date Published: 21 February 2007
PDF: 9 pages
Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 64531I (21 February 2007); doi: 10.1117/12.699099
Show Author Affiliations
Nathan B. Terry, Air Force Institute of Technology (United States)
Kevin Engel, Air Force Institute of Technology (United States)
Thomas G. Alley, Air Force Institute of Technology (United States)
Timothy H. Russell, Air Force Institute of Technology (United States)
Won B. Roh, Air Force Institute of Technology (United States)


Published in SPIE Proceedings Vol. 6453:
Fiber Lasers IV: Technology, Systems, and Applications
Donald J. Harter; Andreas Tünnermann; Jes Broeng; Clifford Headley, Editor(s)

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