39-mW annular excitation of ytterbium fiber laser with radial polarization
✍ Scribed by J.-L. Li; K.-I. Ueda; A. Shirakawa; M. Musha; L.-X. Zhong; Z.-M. Zhang
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 186 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
An efficient radial-polarization Yb-fiber laser with an intracavity Brewster axicon is demonstrated. The fraction of ASE at low pumping and parasitical oscillation are minimized by adopting bidirectional pumping and angle-polished fiber end. So far, except for the improvement in polarization purity and cylindrical symmetry of output beam, 39-mW output power is obtained at 460-mW launched pump power with 13.8% slope efficiency. And also a new type of low-V-parameter multi-mode gain fiber with doughnut concentration distribution of active ions in fiber core profile is predicted to be promising in improving the laser performance further.