Abstract
Femtosecond inscribed fiber Bragg gratings (FBGs) have become more and more an integral part for monolithic fiber lasers in high power systems [1,2]. These gratings overcome the requirements for photosensitive fibers in conventional UV-fabricated FBGs. Thus, the FBGs can be written directly into the active rare-earth doped fiber avoiding additional losses due to splices. One well established approach to inscribe gratings in fibers is the phase mask scanning technique [3]. However, this method is limited in the flexibility due to the fixed period of the phase mask.
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