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Opt Lett. 2007 Jun 1;32(11):1360-2.

Converging-axicon-based radially polarized ytterbium fiber laser and evidence on the mode profile inside the gain fiber.

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Institute for Laser Science, University of Electro-Communications, Tokyo 182-8585, Japan.


The radially polarized mode is achieved from an active Yb fiber by utilizing of an intracavity converging axicon, where the axicon acts as a TM(01) mode selector based on not only its Brewster convex surface but also the distance between its vertex and plane output coupler. The polarization state of the annular laser beam is checked by using a home-made eight-hole aperture. Furthermore, an uncoated plane glass plate is inserted into the cavity, and the reflected beam points to the existence of an annular lasing mode inside the gain fiber. The issues for developing high-power radially polarized fiber lasers also are considered.

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