Recently, the perfect vector (PV) beam has sparked considerable interest because its radius is independent of the topological charge (TC), which has demonstrated special capabilities in optical manipulation, microscopy imaging, and laser micromachining. Previous research about the generation and manipulation of such PV beams only focuses on the linear optical fields. Therefore, the generation of nonlinear PV beams is still lacking. Here, we propose a dual waveband generator to simultaneously generate the PV beams in linear and nonlinear wavebands. In our experiment, PV beams with different polarization states are realized. It is proved that the polarization states of the generated PV beams can be flexibly adjusted by changing the axis direction of a half wave plate. The experimental results show that the radii of the generated PV beams are equal and independent of the TCs. With proper alteration of the nonlinear crystals, this approach could be further extended to other nonlinear processes, such as sum-frequency generation and difference-frequency generation.

中文翻译：

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完美矢量光束的双波段发生器

最近，完美矢量 (PV) 光束引起了相当大的兴趣，因为它的半径与拓扑电荷 (TC) 无关，拓扑电荷 (TC) 在光学操作、显微成像和激光微加工方面表现出特殊能力。以前关于这种 PV 光束的产生和处理的研究只集中在线性光场上。因此，仍然缺乏非线性光伏光束的生成。在这里，我们提出了一种双波段发生器，以同时生成线性和非线性波段的 PV 光束。在我们的实验中，实现了具有不同偏振态的 PV 光束。证明可以通过改变半波片的轴方向来灵活调整所产生的光伏光束的偏振态。实验结果表明，所产生的 PV 光束的半径相等且与 TC 无关。通过适当改变非线性晶体，这种方法可以进一步扩展到其他非线性过程，例如和频生成和差频生成。