Laser beams with screw dislocations in their wavefronts

By V. Bazhenov, M. Vasnetsov, M. Soskin. 2003

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Theory and applications of free-electron vortex states (2017, background): “of the 1990s [28, 27, 29, 30] caused enormous interest and initiated the rapidly-developing field of optical”
Coherent optical vortices from relativistic electron beams (2013, background): “Traditionally, these “optical vortices” are created by shaping of the phase front of a laser as it passes through different optical media[11–13], such as spiral phase plates[14] or computer generated holograms[15].”
Spin-to-orbital conversion of the angular momentum of light and its classical and quantum applications (2011, background): “only on essentially polarization-independent tools, such as cylindrical lenses [9], spiral phase plates [14], holograms [15–17] (including reconfigurable ones made using spatial light modulators), and Dove prisms, also in suitable interferometric setups [18, 19].”
Philosophical Transactions of the Royal Society A : Mathematical (2017, background): “[12] Bazhnenov VY, Vasnetsov MV and Soskin MS.”
Vortex knots in light (2004, methodology): “Holograms of the design, originally demonstrated by [4, 5], are now widely used to create light beams with vortices embedded, and the orbital angular momentum [6]–[8] with which they are associated.”