A superposition of two Bessel beams, with opposite OAM charge (l = -+2) and different wave vectors, rotates during propagation.

# Author Archives: structuredlight

## Perturbations

Simulation of the phase change of a laser beam as it passes through two cylindrical lenses, with one slowly rotated relative to the other. Notice how the phase changes from being purely astigmatic to spherical, and back.

## Polarisation

The polarisation distribution across a Gaussian beam, propagating through a quarter wave plate which is set at an angle of 45o.

## Holography

Simple schematic illustrating of the great versatility of digital holograms, which we often use in beam shaping.

## Multiplexing of Laguerre-Gaussian beams

Nine holograms used to generate so-called ‘Laguerre-Gaussian’ beams, are multiplexed with different carrier frequencies (left). In the Fourier plane, the carrier frequencies manifest as different spatial positions for each beam (right).