FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Measuring Topological Charges of Optical Vortices with Multi-Singularity Using a Cylindrical Lens |
PENG Yu, GAN Xue-Tao, JU Pei, WANG Ya-Dong, ZHAO Jian-Lin** |
Key Laboratory of Space Applied Physics and Chemistry (Ministry of Education), and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072
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Cite this article: |
PENG Yu, GAN Xue-Tao, JU Pei et al 2015 Chin. Phys. Lett. 32 024201 |
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Abstract We present a simple method to measure the topological charges of optical vortices with multiple singularities. Using a cylindrical lens, a vortex beam can decay into a light field distribution with multiple separated dark holes, whose number just equals the topological charge of the input beam. This conclusion is then verified via experiments and numerical simulations of the propagation of vortex beams with multiple singularities. This method is also reliable to measure the topological charges of broadband vortex beams with different distributions of singularities, which does not resort to multiple beam interferometric experiments.
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Published: 20 January 2015
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PACS: |
42.79.-e
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(Optical elements, devices, and systems)
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42.30.Lr
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(Modulation and optical transfer functions)
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42.25.Fx
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(Diffraction and scattering)
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