Power coupling of Gaussian vortex beam propagation through an optical system with the Cassegrain-telescope receiver in turbulent atmosphere

Model of Gaussian vortex beam propagation through an optical system with the Cassegrain-telescope receiver in turbulent atmosphere is established. With this model, the analytical formulas of the average intensity distribution at the receiver plane are derived, and the influences of the optical topological charge, the propagation distance and the turbulence strength are numerically analyzed. These studies show that optical power at the receiver plane concentrates in an annular area, which is suitable for power coupling by the Cassegrain-telescope receiver; the optical topological charge of the vortex source need to be optimized to access the most power coupling. Under the H-V 5/7 turbulence model, power coupling efficiencies of the optical system with different parameters are calculated. Results show that in comparison with the Gaussian beams, Gaussian vortex beams have great advantages in power coupling of optical systems with the Cassegrain-telescope receivers in turbulent atmosphere, which can be a new attractive application of the vortex beams.