5Mingwei Gao, Chunqing Gao, Zhifeng Lin. Generation and application of the twisted beam with orbit angular momentum[J]. Chin. Opt. Let. , 2007, 5(2) : 89-92.
6J. F. Nye, M. V. Berry. Dislocations in wave trains[J]. Proc. R. Soc. London Ser. A, 1974, 336(1605): 165-190.
7G. A. Swarzlander, Jr. C. T. Law. Optical vortex solitons observed in Kerr nonlinear media[J]. Phys. Rev. Lett. , 1992, 69(17) : 2503-2506.
8M. T. Gabriel, L. Torner. Multicharged vortex evolution in seeded second-harmonic generation[J]. J. Opt. Soc. Am. B, 2000, 17(7) : 1197-1204.
9D. Palacios, D. Rozas, G. A. Swartzlander. Observed scattering into a dark optical vortex core[J]. Phys. Rev. Lett., 2002, 88(10): 103902.
10I. D. Maleev, G. A. Swartzlander. Composite optical vortices [J]. J. Opt. Soc. Am. B,2003, 20(6): 1169-1176.
