A superposition of two Bessel beams, with opposite OAM charge (l = -+2) and different wave vectors, rotates during propagation.
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.
The polarisation distribution across a Gaussian beam, propagating through a quarter wave plate which is set at an angle of 45o.
Simple schematic illustrating of the great versatility of digital holograms, which we often use in beam shaping.
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).