Forward and backward seeded continuous-wave Raman fiber amplifiers based on multimode fibers

Nathan B. Terry; Kevin Engel; Thomas G. Alley; Timothy H. Russell; Won B. Roh

doi:10.1117/12.699099

21 February 2007 Forward and backward seeded continuous-wave Raman fiber amplifiers based on multimode fibers

Nathan B. Terry, Kevin Engel, Thomas G. Alley, Timothy H. Russell, Won B. Roh

Proceedings Volume 6453, Fiber Lasers IV: Technology, Systems, and Applications; 64531I (2007) https://doi.org/10.1117/12.699099
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

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).

Citation Download Citation

Nathan B. Terry, Kevin Engel, Thomas G. Alley, Timothy H. Russell, and Won B. Roh "Forward and backward seeded continuous-wave Raman fiber amplifiers based on multimode fibers", Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 64531I (21 February 2007); https://doi.org/10.1117/12.699099

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