Opt Express. 2022 Nov 21;30(24):44132-44140. doi: 10.1364/OE.476043.
The Newton's rings are interference patterns with concentric rings, and Newton's rings experiment is one of the most famous classic optics experiments. Here, we show that if we use a vortex beam, we can obtain generalized Newton's rings. Unlike traditional Newton's rings, the generalized ones are no longer concentric rings but spiral arms, and fork-shaped dislocations appear in spiral arms. More interesting, we reveal that both the number of spiral arms and the number of fork-shaped dislocations are equal to the value of topological charge of incident vortex beams. Our theoretical results are demonstrated experimentally. This novel interference pattern can be used for measuring the topological charge of vortex beams.
牛顿环是具有同心环的干涉图案，牛顿环实验是最著名的经典光学实验之一。在这里，我们表明，如果使用涡旋光束，我们可以获得广义牛顿环。与传统的牛顿环不同，广义牛顿环不再是同心环，而是螺旋臂，并且在螺旋臂中出现叉形位错。更有趣的是，我们揭示了螺旋臂的数量和叉形位错的数量都等于入射涡旋光束的拓扑电荷值。我们的理论结果通过实验得到了验证。这种新型的干涉图案可用于测量涡旋光束的拓扑电荷。
