Generation of rotating intensity blades by superposing optical vortex beams |
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| Authors: | Dexing Yang Jinhu Zhao Lingchen Kong |
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| Institution: | a Shaanxi Key Laboratory of Optical Information Technology & The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education; School of Science, Northwestern Polytechnical University, Xi'an 710072, Chinab State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an 710119, China |
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| Abstract: | A kind of optical beam with controllable rotating intensity blades is generated by coaxially superposing two optical vortex beams with frequency difference (Δω), different topological charges (m1 and m2) and equal amplitude. It is shown theoretically that the number of the blades is determined by the subtraction of topological charges (m1 − m2) and the angular velocity of the rotating pattern is equal to Δω / (m1 − m2). In our experiment, the rotating beams were generated by two optical vortex beams with opposite topological charges, where the frequency difference is acquired by a rotating plate glass. The results are quite in accordance with the simulations. |
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| Keywords: | Optical manipulation Optical spanners Laser beam combining Computer holography Laser beam shaping |
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