Boston University, 8 Saint Mary’s Street, Boston, Massachusetts 02215, USA.
Opt Lett. 2012 Jul 1;37(13):2451-3. doi: 10.1364/OL.37.002451.
We present a fiber-based method for generating vortex beams with a tunable value of orbital angular momentum from -1ℏ to +1ℏ per photon. We propose a new (to our knowledge) method to determine the modal content of the fiber and demonstrate high purity of the desired vortex state (97% after 20 m, even after bends and twists). This method has immediate utility for the multitude of applications in science and technology that exploit vortex light states.
我们提出了一种基于光纤的方法，能够产生轨道角动量值可调的涡旋光束，每个光子的轨道角动量值可在-ℏ到+ℏ之间变化。我们提出了一种新的（据我们所知）方法来确定光纤的模态内容，并证明了所需的涡旋态的纯度很高（经过 20 米传输后仍有 97%，即使经过弯曲和扭曲也是如此）。这种方法对于利用涡旋光态的众多科学和技术应用具有直接的实用性。
