, Volume 17, Issue 2, pp 124-129

Frequency tuning and doubling in Yb-doped fiber lasers

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A compact Yb-doped fiber laser (YDFL) based on a tunable fiber Bragg grating (FBG) with ∼6 W output power and ∼45 nm tuning around 1080 nm has been developed. The laser output power and its spectral width (∼0.15 nm) do not change significantly at the tuning, while the FBG reflection coefficient increases with an increase in FBG compression. It has been shown that this increase is due to stress-induced changes in the FBG’s refractive-index modulation amplitude. Intracavity frequency doubling in the YDFL has also been performed. About 0.4 W of green radiation with tuning in the range 540–548 nm has been achieved with a KTP nonlinear crystal.

Original Text © Astro, Ltd., 2007.