In this Letter, we experimentally investigate the propagation dynamics of truncated vector vortex beams generated using a Sagnac interferometer. Upon focusing, the truncated vector vortex beam is found to regain its original intensity structure within the Rayleigh range. In order to explain such behavior, the propagation dynamics of a truncated vector vortex beam is simulated by decomposing it into the sum of integral charge beams with associated complex weights. We also show that the polarization of the truncated composite vector vortex beam is preserved all along the propagation axis. The experimental observations are consistent with theoretical predictions based on previous literature and are in good agreement with our simulation results. The results hold importance as vector vortex modes are eigenmodes of the optical fiber.

中文翻译：

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截断矢量涡旋光束的传播动力学研究

在这封信中，我们实验研究了使用Sagnac干涉仪产生的截断矢量涡旋光束的传播动力学。聚焦后，发现截断的矢量涡旋光束在瑞利范围内恢复了其原始强度结构。为了解释这种行为，通过将截断的矢量涡旋束分解为具有相关复数权重的积分电荷束之和来模拟其传播动力学。我们还表明，截断的复合矢量涡旋光束的偏振在整个传播轴上都得以保留。实验观察结果与基于先前文献的理论预测是一致的，并且与我们的模拟结果非常吻合。由于矢量涡旋模式是光纤的本征模式，因此结果具有重要意义。