Uniformly orbitalized beams

We show that an incoherent superposition of perfect correlation vortex sources with different OAM indices maintains a uniform degree of orbitalization everywhere outside of the vortex core. In the nearly incoherent source limit, the orbitalization of the beam radiated by such a source remains invariant upon propagation in free space. Moreover, we can control the degree of orbitalization by adjusting weighting coefficients. We further demonstrate that the degree of orbital anisotropy, the OAM concurrence, and the OAM degree of coherence are invariant upon free-space propagation as well.