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We report on a tunable ytterbium-doped fiber laser bridging the gap from three-level lasing around 980 nm to true four-level lasing at 1066 nm. Wavelength-locking and -tuning was achieved by an external volume-Bragg grating (VBG). Results are compared with a numerical analysis based on a spectrally resolved rate equation analysis.
A linearly polarized fiber laser emitting at 979 nm with an output power of 2 W is presented. By using a photodarkening-resistant Yb/Ce/Al-codoped silica fiber, degradation-free operation is achieved over several hours.
In this presentation the latest results on volume Bragg grating locked fiber lasers will be reviewed. This novel technique provides one to two orders of magnitude improved spectral brightness, improved temporal stability and at least equally efficient lasing as when ordinary dielectric mirrors are used. Results on tuning and photodarkening resistant fiber lasers are also presented, as well as some...
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