Characterizing vortex beam with angular-double-slit interference
Ruifeng Liu, Junling Long, Feiran Wang, Yunlong Wang, Pei Zhang, Hong, Gao, and Fuli Li
TL;DR
This paper investigates the diffraction patterns of vortex beams using an angular-double-slit interferometer, revealing the spiral phase structure and enabling differentiation of Laguerre-Gaussian beam orders.
Contribution
It introduces an angular-double-slit interference method to clearly identify vortex beam phase structures and distinguish different beam orders.
Findings
Spiral phase structure is clearly revealed in the interference pattern.
The method effectively differentiates Laguerre-Gaussian beam orders.
Provides insights into the nature of orbital angular momentum in vortex beams.
Abstract
The Fraunhofer diffraction intensity distribution of Laguerre-Gaussian beam is studied in an angular-double-slit interferometer. We demonstrate that the spiral phase structure of vortex light can be clearly revealed in this interference geometry, and it gives us an efficient way to distinguish different order of Laguerre-Gaussian beams. This angular-double-slit interference gives us a better understanding to the nature of orbital angular momentum and the interpretation of vortex beams interference phenomenon.
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