[1] Allen L., Beijersbergen M. W., Spreeuw R. J. C. et al.. Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes[J]. Phys. Rev. A, 1992, 45(11): 8185~8189
[2] Barnett S. M., Allen L.. Orbital angular momentum and nonparaxial light beams[J]. Opt. Commun., 1994, 110(5-6): 670~678
[3] Beijersbergen M. W., Coerwinkel R. P. C., Kristensen M. et al.. Helical wavefront laser beams produced with a spiral phaseplate[J]. Opt. Commun., 1994, 112(5-6): 321~327
[4] Turnbull G. A., Robertson D. A., Smith G. M. et al.. The generation of free-space Laguerre-Gaussian modes at millimeter-wave frequencies by use of a spiral phase plate[J]. Opt. Commun., 1996, 127(4-6): 183~188
[5] Curtis J. E., Koss B. A., Grier D. G.. Dynamic holographic optical tweezers[J]. Opt. Commun., 2002, 207(1-6): 169~175
[6] Li Yangyue, Chen Ziyang, Liu Hui et al.. Generation and interference of vortex beams[J]. Acta Physica Sinica, 2010, 59(3): 1740~1748
[7] Wang Xiao, Littman M. G.. Laser cavity for generation of variable-radius rings of light[J]. Opt. Lett., 1993, 18(10): 767~768
[8] Yin Jianping, Liu Nanchun, Xia Yong et al.. Generation of hollow laser beams and their applications in modern optics[J]. Progress in Physics, 2004, 24(3): 336~380
[9] Abramochkin E., Losevsky N., Volostnikov V.. Generation of spiral-type laser beams[J]. Opt. Commun., 1997, 141(1-2): 59~64
[10] Schweiger Gustav, Nett Ralf, Ozel Bilal et al.. Generation of hollow beams by spiral rays in multimode light guides[J]. Opt. Express, 2010, 18(5): 4510~4517
[11] Guo Chengshan, Liu Xuan, He Jingliang et al.. Optimal annulus structures of optical vortices[J]. Opt. Express, 2004, 12(19): 4625~4634
[12] Gao Chunqing, Qi Xiaoqing, Liu Yidong et al.. Superposition of helical beams by using a Michelson interferometer[J]. Opt. Express, 2010, 18(1): 72~78
[13] Gradshteyn I. S., Ryzhik I. M.. Table of Integrals, Series, and Products[M]. San Diego: Academic Press,1980. 910~914