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Focusing of Partially Coherent Vortex Beams by an Aperture Lens |
| RAO Lian-Zhou 1,2; PU Ji-Xiong1 |
| 1Department of Electronic Science and Technology, Huaqiao University, Quanzhou 3620212Department of Physics and Electromechanical Engineering, Sanming University, Sanming 365004 |
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| Cite this article: |
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RAO Lian-Zhou, PU Ji-Xiong 2007 Chin. Phys. Lett. 24 1252-1255 |
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Abstract The focusing properties of partially coherent vortex wave fields are studied. Expressions are derived for the intensity distribution and the degree of coherence near the geometrical focus. It is found that the size of coherence vortex dark core in the focal region depends on the topological charges and normalized coherence lengths. It is found that the desired vortex dark core near the geometrical focus can be generated by choosing appropriate values of parameters. The degree of coherence possesses a pair of phase singularities regions in the geometrical focus neighbourhood.
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| Keywords:
42.25.Kb
42.25.Fx
41.85.Lc
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Received: 14 December 2006
Published: 23 April 2007
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| PACS: |
42.25.Kb
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(Coherence)
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42.25.Fx
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(Diffraction and scattering)
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41.85.Lc
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(Particle beam focusing and bending magnets, wiggler magnets, and quadrupoles)
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