We demonstrated all polarization-maintaining fiber (PMF) lasers which could offer selective transverse mode emission by polarization rotation technique (PRT). Offset and cross splicing between PMF sections was used to generate higher order mode and to yield a birefringence induced mode filter. PRT was used to select the output beam profile. Both linear cavity and ring cavity were explored. Experimentally, 360° rotating LP₁₁ mode and OAM vortex beam with ±1 topological charge has been realized from an all PMF linear cavity laser and a ring cavity laser respectively.

中文翻译：

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所有保偏光纤激光器的选择性横模发射

我们展示了所有可以通过偏振旋转技术 (PRT) 提供选择性横模发射的保偏光纤 (PMF) 激光器。PMF 部分之间的偏移和交叉拼接用于生成更高阶模式并产生双折射诱导模式滤波器。PRT 用于选择输出光束轮廓。探索了线性腔和环形腔。通过实验，分别从全PMF线性腔激光器和环形腔激光器实现了360°旋转LP ₁₁模式和具有±1拓扑电荷的OAM涡旋光束。