Lin Di, Daniel J M O, Gecevičius M, Beresna M, Kazansky P G, Clarkson W A
Opt Lett. 2014 Sep 15;39(18):5359-61. doi: 10.1364/OL.39.005359.
A simple technique for directly generating a radially polarized output beam from a cladding-pumped ytterbium-doped fiber laser is reported. Our approach is based on the use of a nanograting spatially variant waveplate as an intracavity polarization-controlling element. The laser yielded ~32 W of output power (limited by available pump power) with a radially polarized TM (01)-mode output beam at 1040 nm with a corresponding slope efficiency of 66% and a polarization purity of 95%. The beam-propagation factor (M(2)) was measured to be ~1.9-2.1.
报道了一种从包层泵浦掺镱光纤激光器直接产生径向偏振输出光束的简单技术。我们的方法基于使用纳米光栅空间可变波片作为腔内偏振控制元件。该激光器在1040nm处产生了约32W的输出功率（受可用泵浦功率限制），具有径向偏振的TM(01)模式输出光束，相应的斜率效率为66%，偏振纯度为95%。测量得到光束传播因子（M(2)）约为1.9 - 2.1。
