Li Jian-lang, Ueda Ken-ichi, Musha Mitsuru, Shirakawa Akira, Zhang Zhi-ming
Institute for Laser Science, University of Electro-Communications, Tokyo 182-8585, Japan.
Opt Lett. 2007 Jun 1;32(11):1360-2. doi: 10.1364/ol.32.001360.
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.
通过利用腔内会聚轴棱锥从有源镱光纤中获得径向偏振模式，其中轴棱锥不仅基于其布儒斯特凸面，还基于其顶点与平面输出耦合器之间的距离，充当TM(01)模式选择器。使用自制的八孔光阑检查环形激光束的偏振态。此外，将一块未镀膜的平面玻璃板插入腔内，反射光束表明增益光纤内部存在环形激光模式。还考虑了开发高功率径向偏振光纤激光器的相关问题。
