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Optical Engineering

Study on the generation of a vortex laser beam by using phase-only liquid crystal spatial light modulator
Author(s): Haotong Ma; Haojun Hu; Wenke Xie; Xiaojun Xu
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Paper Abstract

The generation of vortex laser beam by using phase-only liquid crystal spatial light modulator (LC-SLM) combined with the spiral phase screen is experimentally and theoretically studied. Results show that Gaussian and dark hollow vortex laser beams can be generated by using this method successfully. Differing with the Gaussian and dark hollow beams, far field intensities of the generated vortex laser beams still exhibit dark hollow distributions. The comparisons between the ideal generation and experimental generation of vortex laser beams with different optical topological charges by using phase only LC-SLM is investigated in detail. Compared with the ideal generated vortex laser beam, phase distribution of the experimental generated vortex laser beam contains many phase singularities, the number of which is the same as that of the optical topological charges. The corresponding near field and far field dark hollow intensity distributions of the generated vortex laser beams exhibit discontinuous in rotational direction. Detailed theoretical analysis show that the main reason for the physical phenomenon mentioned above is the response error of phase only LC-SLM. These studies can provide effective guide for the generation of vortex laser beam by using phase only LC-SLM for optical tweezers and free space optical communication.

Paper Details

Date Published: 26 April 2013
PDF: 10 pages
Opt. Eng. 52(9) 091721 doi: 10.1117/1.OE.52.9.091721
Published in: Optical Engineering Volume 52, Issue 9
Show Author Affiliations
Haotong Ma, National Univ. of Defense Technology (China)
Haojun Hu, National Univ. of Defense Technology (China)
Wenke Xie, National Univ. of Defense Technology (China)
Xiaojun Xu, National Univ. of Defense Technology (China)


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