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 ${\mathrm{CO}}_2$ 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.

© 2010 Optical Society of America

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