Suppression of stimulated Raman scattering employing long period gratings in double-clad fiber amplifiers.
We report on the suppression of stimulated Raman scattering (SRS) in a double-clad fiber amplifier using long-period gratings (LPGs). The LPGs, fabricated with a CO(2) laser, achieve SRS suppression by coupling the Stokes wavelength from the active core into the cladding. With only three LPGs inserted into a fiber pulse amplifier, the extractable Raman-free output power was nearly doubled. A numerical simulation of the setup shows good agreement with the experimental results.
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Institute of Applied Physics, Friedrich-Schiller-University Jena, Albert-Einstein-Strasse 15, 07745 Jena, Germany.
Jauregui
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Jansen
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Limpert
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Tünnermann
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