PDF(4446 KB)
Study on the Interference Characteristics of Vortex Beams
LIANG Chenggong, YANG Ying, WEI Min, DUAN Zhiyan
PDF(4446 KB)
PDF(4446 KB)
Study on the Interference Characteristics of Vortex Beams
In this paper, we used MATLAB (MATrix LABoratory) to simulate the interference patterns of two fractional-order vortex beams (Laguerre-Gaussian beams) with opposite topological charges (l), as well as the interference patterns of two unequal vortex beams (Laguerre-Gaussian beams) with different topological charges, in which the radial indices (p) are arbitrary non-negative integers. Through theoretical analysis, we found that as the topological charges and radial indices of the beams change, the interference patterns of the Laguerre-Gaussian beams change accordingly. The number of spots in the interference pattern of the equal-heterodyne fractional-order Laguerre-Gaussian beam is , and the number of spot layers is p+1; the interference result of the non-equal-heterodyne Laguerre-Gaussian beam is similar to that of the equal-heterodyne Laguerre-Gaussian beam. In the interference pattern of non-equal same-sign Laguerre-Gaussian beams, when the absolute value of the difference in topological charges is small, the number of bright spots is . When this absolute value is large, a pattern of alternating bright and dark concentric rings appears. Our work may provide a new method for measuring the topological charges and radial indices of vortex beams.
vortex beams / Laguerre-Gaussian beam / number of topological charges / radial index / interference
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