Li Ya-Ping, Wang Fang-Xiang, Chen Wei, Zhang Guo-Wei, Yin Zhen-Qiang, He De-Yong, Wang Shuang, Guo Guang-Can, Han Zheng-Fu
Opt Lett. 2019 Feb 15;44(4):755-758. doi: 10.1364/OL.44.000755.
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.
可调谐分束器（TBS）是光学实验中使用的一种基本组件。TBS可以保持轨道角动量（OAM）状态；此外，光子的偏振态对于一些特定实验很有价值，例如高维量子信息处理。我们使用偏振分束器和半波片在紧凑的结构下实现这样一个TBS，这与现有工作相比可以减少所需元件的数量。实验验证了该TBS在可调谐性、偏振和OAM状态保持方面具有良好的性能。使用所提出的TBS实现了一个萨格纳克干涉仪来评估其实际可用性，并且在不同偏振态下大于99.30%的平均可见度证明了其在光信息处理方面的潜力。
