| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Properties of Fraunhofer Diffraction by an Annular Spiral Phase Plate for Sidelobe Suppression |
| CHEN Jun1,2, KUANG Deng-Feng1, FANG Zhi-Liang1 |
| 1The Key Laboratory of Opto-electronic Information Science and Technology, Institute of Modern Optics (Ministry of Education), Nankai University, Tianjin 3000712Department of Physics, Taishan University, Tai'an 271021 |
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| Cite this article: |
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CHEN Jun, KUANG Deng-Feng, FANG Zhi-Liang 2009 Chin. Phys. Lett. 26 094210 |
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Abstract A simple and accurate method for calculating the optimal width of an annular spiral phase plate (SPP) to generate optical vortices with sidelobe suppression is proposed. The sidelobes can be sharply suppressed when the ratio of inner and outer radii of an annular SPP is equal to that of the principal ring and the first sidelobe diffracted by a circular SPP with the same topological charge n. Moreover, the ratio of the inner and outer radii of the optimal annular SPP depends only on the topological charge n and is not affected by the incident wavelength or the size of the SPP.
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| Keywords:
42.25.Fx
42.25.Bs
42.60.Jf
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Received: 31 March 2009
Published: 28 August 2009
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| PACS: |
42.25.Fx
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(Diffraction and scattering)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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42.60.Jf
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(Beam characteristics: profile, intensity, and power; spatial pattern formation)
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