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Suppression of stimulated Raman scattering employing long period gratings in double-clad fiber amplifiers

 
: Nodop, D.; Jauregui, C.; Jansen, F.; Limpert, J.; Tünnermann, A.

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Optics Letters 35 (2010), No.17, pp.2982-2984
ISSN: 0146-9592
English
Journal Article
Fraunhofer IOF ()
mode operation; laser; gain; core

Abstract
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 CO2 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.

: http://publica.fraunhofer.de/documents/N-141275.html