The propagation property of Laguerre-Gaus- sian （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 ...The propagation property of Laguerre-Gaus- sian （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 self- reconstruction properties of the generated Bessel beams were experimentally verified.展开更多
文摘The propagation property of Laguerre-Gaus- sian （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 self- reconstruction properties of the generated Bessel beams were experimentally verified.
