Transformation of Laguerre-Gaussian beam by a ring-lens
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The propagation property of Laguerre-Gaussian (LG) beams passing through a diffractive ring-lens (RL) was studied, where the RL was generated by a liquid crystal spatial light modulator (LC-SLM). It was found that the LG beam was transformed into a sharp ring at the focal plane first, and then a Bessel-similar beam was formed behind the focal plane but the beam size was enlarged with the increase of propagation distance. With the help of a group of lenses, the beam was further collimated into a Bessel beam. Finally, the “non-diffractive” and selfreconstruction properties of the generated Bessel beams were experimentally verified.
Keywordsring-lens (RL) Bessel beam spatial light modulator (SLM)
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This work was supported by the Program for ChangJiang Scholars and Innovative Research Team in University, PCSIRT (IRT1212), the National Natural Science Foundation of China (Grant Nos. 61475021 and 61108047).
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