Mode sorting is an essential function for optical multiplexing systems that exploit the
orthogonality of the orbital angular momentum mode space. The familiar log-polar optical …

On-chip twisted light emitters are essential components of orbital angular momentum (OAM)
communication devices 1, 2. These devices address the growing demand for high-capacity …

The effect of atmosphere turbulence on light's spatial structure compromises the information
capacity of photons carrying the Orbital Angular Momentum (OAM) in free-space optical …

We present a method to efficiently multiply or divide the orbital angular momentum (OAM) of
light beams using a sequence of two optical elements. The key element is represented by an …

Multiplexing and demultiplexing of optical orbital angular momentum (OAM) are critical
operations in mode-division multiplexing communications. Traditional Dammann gratings …

Optical vortex beams can be used as carriers of information in optical communication and
quantum optics applications. Owing to their spatial orthogonality, these beams can be …

It has long been recognized that photons carry spin angular momentum that corresponds to
polarization. During the last two decades, research has revealed that lightwaves can carry …

The propagation of several spatial modes has a significant impact on the structure of the
emission from parametric down-conversion in a nonlinear waveguide. This manifests itself …

We report, for the first time, the generation of a 1173 nm acousto-optic Q-switched self-
Raman vortex laser with an axicon-based annular pump system. A 20 mm long Nd: GdVO4 …

Orbital angular momentum (OAM) states of photons span a high-dimensional Hilbert space,
and by using it, higher information capacity and enhanced security can be achieved for both …