Measurement of orbital angular momentum of vortex beam by topological charge difference method
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摘要:
本文提出一种针对涡旋光轨道角动量的拓扑荷差值检测技术。通过两束拓扑荷不同的涡旋光得到周期性的差值法强度分布图，读取其中一个周期的光斑个数，可快速准确地计算出待测涡旋光的轨道角动量。相比干涉法和衍射法等需要接收完整涡旋光的传统检测方法，拓扑荷差值法只需接收小部分涡旋光即可进行测量，这在高阶的、大尺寸的涡旋光测量方面有非常大的优势，在涡旋光的远距离自由空间光通信方面具有潜在的应用。
Abstract:This paper presents a topological load difference detection technique for the orbital angular momentum of vortex beams. Two vortex beams with different topological charges obtained the periodic intensity distribution. The orbital angular momentum of the vortex beam to be measured can be quickly and accurately calculated by reading the number of spots in one period. The traditional interference and diffraction methods need to receive the complete vortex beam. In contrast, the topological charge difference method only needs to receive a small amount of vortex beam to measure. This has great advantages in the measurement of high-order and large-scale vortex beams. It has potential applications in long-distance free-space optical communication of vortex beams.
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图 1 拓扑荷差值法测量光路图
Figure 1. Topological load difference method measures the optical path diagram
图 2 (a) l=6和(b) l=4的涡旋光的共轭干涉态，(c)为它们的叠加态
Figure 2. Conjugate interference modes of vortex beams with OAM of (a) l=6 and (b) l=4, (c) is their superposition
图 3 不同拓扑荷与差值的强度分布图
Figure 3. Intensity distribution of different topological loads and differences
图 4 差值n=2，(a) l待测和(b) l=4的涡旋光的强度分布图
Figure 4. Intensity distribution of vortex beams with a difference of n=2, (a) l to be measured, and (b) l = 4
图 5 离轴涡旋光拓扑荷差值法测量过程
Figure 5. Measurement process of the topological charge difference method of an off-axis vortex beam
图 6 不同离轴率下的差值法强度分布图
Figure 6. Intensity distribution of the difference method at different off-axis rates
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