Beam shaping with vortex beam generated by liquid crystal spatial light modulator

Yue Gao; Ke Liu; Zeng-yu Sun; Lei Guo; Yu Gan

doi:10.1117/12.2181542

6 March 2015 Beam shaping with vortex beam generated by liquid crystal spatial light modulator

Yue Gao, Ke Liu, Zeng-yu Sun, Lei Guo, Yu Gan

Proceedings Volume 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation; 94463Z (2015) https://doi.org/10.1117/12.2181542
Event: International Symposium on Precision Engineering Measurement and Instrumentation, 2014, Changsha/Zhangjiajie, China

Abstract

An optical vortex is a beam of light with phase varying in a corkscrew-like manner along its direction of propagation and so has a helical wavefront. When such a vectorial vortex beam and the Gaussian beam with orthogonal polarization are focused by low NA lens, the Gaussian component causes a focal intensity distribution with a solid center and the vortex component causes a donut distribution with hollow dark center. The shape of the focus can be continuously varied by continuously adjusting the relative weight of the two components. Flat top focusing can be obtained under appropriate conditions. It is demonstrated through experiments with a liquid crystal spatial light modulator in such a beam, that flattop focus can be obtained by vectorial vortex beams with topological charge of +1 to achieve beam shaping vortex.

Citation Download Citation

Yue Gao, Ke Liu, Zeng-yu Sun, Lei Guo, and Yu Gan "Beam shaping with vortex beam generated by liquid crystal spatial light modulator", Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94463Z (6 March 2015); https://doi.org/10.1117/12.2181542

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