The tunable beam splitter (TBS) is a fundamental component used in optical experiments. A TBS can preserve the orbital angular momentum (OAM) states; in addition, the polarization states of photons are valuable for some particular experiments, such as high-dimensional quantum information processing. We use polarization beam splitters and half-wave plates to realize such a TBS under a compact structure, which can reduce the number of elements that require comparing with existing works. The experiments verify that the TBS has good performances in tunability, polarization, and OAM state preservation. A Sagnac interferometer is implemented with the proposed TBS to evaluate its practical usability, and the mean visibilities greater than 99.30% under varying polarization states demonstrate its potential for optical information processing.

中文翻译：

---

一种节省资源的偏振无关轨道角动量保持可调分束器的实验实现

可调分束器（TBS）是光学实验中使用的基本组件。TBS可以保留轨道角动量（OAM）状态。此外，光子的偏振态对于某些特定的实验（例如高维量子信息处理）也很有价值。我们使用偏振分束器和半波片在紧凑的结构下实现这样的TBS，与现有工作相比可以减少所需的元件数量。实验证明，TBS在可调性，极化和OAM状态保存方面具有良好的性能。Sagnac干涉仪与拟议的TBS一起使用，以评估其实用性，并且在变化的偏振态下，平均可见度大于99.30％，证明了其在光学信息处理方面的潜力。