Interference patterns of two LG0l vortex beams for coaxial and off-axial superposition

Jingbo Ma; Peng Li; Ziheng Zhou; Zhenkun Wu; Yuzong Gu

doi:10.1117/12.2599781

18 June 2021 Interference patterns of two LG_0l vortex beams for coaxial and off-axial superposition

Jingbo Ma, Peng Li, Ziheng Zhou, Zhenkun Wu, Yuzong Gu

Proceedings Volume 11850, First Optics Frontier Conference; 118501E (2021) https://doi.org/10.1117/12.2599781
Event: First Optics Frontier Conference, 2021, Hangzhou, China

Abstract

The interference patterns between two vortex beams are systematically studied in experiment. Vortex beams with different topological charges (TCs) (±1, ±2, ±3) are generated by modulating the fundamental Gaussian beam with the spiral phase plate, and an improved Mach-Zehnder interferometer is built to study these different interference patterns. When two interference beams are both plane waves, off-axis interference produces fork-shaped interference patterns. The fork direction and the fork number in the fork-shaped patterns are related to the TCs and orientation relation of two vortex beams. When two LG_0l vortex beams with different curvature radii interferes coaxially, the interference pattern with a spiral structure is generated, the spiral direction and spiral leaves depend on the curvature radii and TCs of two interfered vortex beams. Coaxial interference of two vortex beams with the same curvature radius produces the spiral-shaped pattern with a petal-shaped (or wheel-shaped) structure (a composite vortex field).

Citation Download Citation

Jingbo Ma, Peng Li, Ziheng Zhou, Zhenkun Wu, and Yuzong Gu "Interference patterns of two LG_0l vortex beams for coaxial and off-axial superposition", Proc. SPIE 11850, First Optics Frontier Conference, 118501E (18 June 2021); https://doi.org/10.1117/12.2599781

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