[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]. Physical Review A, 45, 8185-8189(1992).
[2] Yang C Y, Xu C, Ni W J et al. Turbulence heterodyne coherent mitigation of orbital angular momentum multiplexing in a free space optical link by auxiliary light[J]. Optics Express, 25, 25612-25624(2017).
[3] Ruffato G, Massari M, Romanato F. Diffractive optics for combined spatial- and mode- division demultiplexing of optical vortices: design, fabrication and optical characterization[J]. Scientific Reports, 6, 24760(2016).
[4] Gecevi ius M, Drevinskas R, Beresna M et al. . Single beam optical vortex tweezers with tunable orbital angular momentum[J]. Applied Physics Letters, 104, 231110(2014).
[5] Padgett M, Bowman R. Tweezers with a twist[J]. Nature Photonics, 5, 343-348(2011).
[6] Ding D S, Zhang W, Zhou Z Y et al. Quantum storage of orbital angular momentum entanglement in an atomic ensemble[J]. Physical Review Letters, 114, 050502(2015).
[7] Liu J P, Min C J, Lei T et al. Generation and detection of broadband multi-channel orbital angular momentum by micrometer-scale meta-reflectarray[J]. Optics Express, 24, 212-218(2016).
[8] Huang H, Ren Y X, Yan Y et al. Performance analysis of spectrally efficient free-space data link using spatially multiplexed orbital angular momentum beams[J]. Proceedings of SPIE, 8647, 864706(2013).
[10] Hickmann J M. Fonseca E J S, Soares W C, et al. Unveiling a truncated optical lattice associated with a triangular aperture using light's orbital angular momentum[J]. Physical Review Letters, 105, 053904(2010).
[13] Fu D Z, Chen D X, Liu R F et al. Probing the topological charge of a vortex beam with dynamic angular double slits[J]. Optics Letters, 40, 788-791(2015).
[14] Li X Z, Tai Y P, Lü F et al. Measuring the fractional topological charge of LG beams by using interference intensity analysis[J]. Optics Communications, 334, 235-239(2015).
[16] Lü F, Li X Z, Tai Y P et al. High-order topological charges measurement of LG vortex beams with a modified Mach-Zehnder interferometer[J]. Optik, 126, 4378-4381(2015).
[17] Dai K J, Gao C Q, Zhong L et al. Measuring OAM states of light beams with gradually-changing-period gratings[J]. Optics Letters, 40, 562-565(2015).
[18] Guo C S, Lu L L, Wang H T. Characterizing topological charge of optical vortices by using an annular aperture[J]. Optics Letters, 34, 3686-3688(2009).
[19] Guo C S, Yue S J, Wei G X. Measuring the orbital angular momentum of optical vortices using a multipinhole plate[J]. Applied Physics Letters, 94, 231104(2009).
[21] Zheng S, Wang J. Measuring orbital angular momentum (OAM) states of vortex beams with annular gratings[J]. Scientific Reports, 7, 40781(2017).
[22] Gao H, Han Y H, Li Y et al. Topological charge measurement of concentric OAM states using the phase-shift method[J]. Journal of the Optical Society of America A, 35, A40-A44(2018).
[24] Zhou J, Zhang W H, Chen L X. Experimental detection of high-order or fractional orbital angular momentum of light based on a robust mode converter[J]. Applied Physics Letters, 108, 111108(2016).
[25] Padgett M J, Miatto F M. Lavery M P J, et al. Divergence of an orbital-angular-momentum-carrying beam upon propagation[J]. New Journal of Physics, 17, 023011(2015).