Terahertz (THz) noise sources play an irreplaceable role in testing THz devices and evaluating application systems, the flatness of their radio frequency (RF) spectra is important technical parameter. In this paper, a scheme for generating flat by mixing multiple filtered incoherent light fields proposed. A theoretical analysis conducted to investigate impact different spectral linewidths centr...

The rotational Doppler shift (RDS) is typically measured by illuminating a rotating target with laser prepared in simple, known orbital angular momentum (OAM) superposition. We establish theoretically and experimentally that detecting the does not require incident light to have well-defined OAM spectrum but instead requires correlations within spectrum. demonstrate measurement of using spatiall...

We generate double-charge white-light optical vortices by sending a circularly polarized partially incoherent light through an uniaxial crystal. We show that the generated polichromatic vortices are structurally stable, and their correlation properties can be altered by the beam focusing, resulting in changes of the vortex core visibility.