A helical Yb³⁺-doped three-core microstructure fiber (YTMF) amplifier is proposed in this paper, so as to solve the problem of generation and transmission of the orbital angular momentum (OAM) beams. The fiber is composed of three Yb³⁺-doped cores with a regular triangle shape and a longitudinal helical structure. The experimental results show that the 1064nm laser can be amplified due to the fluorescence amplification characteristics of the doped material Yb³⁺. Furthermore, theoretical analysis indicates the modes in YTMF at 1064nm, which is located in the amplified wavelength, can support nine modes carrying OAM. Therefore, the related experiments were performed and verified that the transmission modes can respectively carry 1, 2, and 3-order OAM at 1064nm in different coupling cases. These excellent properties indicate that the combination of doped materials and helical fiber provide favorable conditions for the generation and amplification of OAM, which provides a basis for the further development of OAM beams in the field of quantum communication and dense space division multiplexing.

中文翻译：

---

掺Yb3 +的三芯扭曲微结构光纤中的轨道角动量放大螺旋矢量模式。

提出了一种掺Yb ^3+的三芯螺旋光纤（YTMF）放大器，以解决轨道角动量（OAM）光束的产生和传输问题。纤维由三个具有规则三角形形状和纵向螺旋结构的Yb ³⁺掺杂纤芯组成。实验结果表明，由于掺杂材料Yb ³⁺的荧光放大特性，可以放大1064nm激光。。此外，理论分析表明，位于1064nm处的YTMF中的模式位于放大的波长中，可以支持携带OAM的9个模式。因此，进行了相关实验，验证了在不同耦合情况下，传输模式可以分别在1064nm传输1、2和3阶OAM。这些优异的性能表明，掺杂材料和螺旋纤维的结合为OAM的产生和放大提供了有利条件，为进一步发展OAM光束在量子通信和密集空分复用领域奠定了基础。