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Creation of a hollow laser beam using self-phase modulation in a nematic liquid crystal[J] . A. Shevchenko,S.C. Buchter,N.V. Tabiryan,M. Kaivola.Optics Communications . 2004 (1)
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Intensity distribution of Gaussian beams focused by a lens with spherical aberration[J] . Jixiong Pu,Huihua Zhang.Optics Communications . 1998 (4)