Papers & References

Azimuthal beam shaping in orbital angular momentum basis

GAEA / GAEA-2 Spatial Light Modulators
Beam Shaping / Beam Steering Higher Order Modes / Optical Vortex / OAM
Published on:
Authors: Zhongzheng Lin, Weihang Zhong, Lixun Wu, Lin He, Hongjia Chen, Jianqi Hu, Yujie Chen, Siyuan Yu
Abstract:

Shaping the light beam is always essential for laser technology and its applications. Among the shaping technologies, shaping the laser in its Fourier domain is a widely used and effective method, such as a pulse shaper, or a 4f system with a phase mask or an iris in between. Orbital angular momentum (OAM) modes spectrum, the Fourier transform of the light field in azimuth, provides a perspective for shaping the light. Here, we propose and experimentally demonstrate a shaping strategy for the azimuthal field by modulating the complex amplitude of the OAM mode spectrum. The scheme utilizes multi-plane light conversion technology and consists only of a spatial light modulator and a mirror. Multiple functions, including beam rotating, beam splitting/combining in azimuth, and OAM mode filtering, are demonstrated. Our work provides a compact and programmable solution for modulating the OAM mode spectrum and shaping beams in azimuth.

Open Access

Publication: Advanced Photonics Nexus
Issue/Year: Advanced Photonics Nexus, Vol. 3, Issue 2, 026001 (February 2024)
DOI: 10.1117/1.APN.3.2.026001
Link: https://doi.org/10.1117/1.APN.3.2.026001
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