2024
DOI: 10.3390/photonics11050463
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Generation of Propagation-Dependent OAM Self-Torque with Chirped Spiral Gratings

Ruediger Grunwald,
Mathias Jurke,
Max Liebmann
et al.

Abstract: The application of non-uniform spiral gratings to control the structure, topological parameters and propagation of orbital angular momentum (OAM) beams was studied experimentally with coherent near-infrared light. Adapted digital spiral grating structures were programmed into the phase map of a high-resolution liquid-crystal-on-silicon spatial light modulator (LCoS-SLM). It is shown that characteristic spatio-spectral anomalies related to Gouy phase shift can be used as pointers to quantify rotational beam pro… Show more

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