Phase discontinuities induced scintillation enhancement: coherent vortex beams propagating through weak oceanic turbulence

Abstract

Under the impact of an infinitely extended edge phase dislocation, optical vortices (screw phase dislocations) induce scintillation enhancement. The scintillation index of a beam consisting of two Gaussian vortex beams with $\pm 1$ topological charges through weak oceanic turbulence is researched via derivation and phase screen simulation. Different combinations of two types of phase discontinuities can be obtained by changing the overlapping degree and the phase difference of two coherent Gaussian vortex beams. The scintillation indexes for them verify that the formation condition of the phenomenon is the coexistence of two types of phase discontinuities. And the enhanced scintillation index can be several orders of magnitude larger than that of a plane wave under weak perturbation (Rytov variance). This phenomenon could be useful for both optical vortex detection and perturbation measurement.

References in corpus (3)

• Spatial power spectrum of natural water turbulence with any average temperature, salinity concentration and light wavelength
• Wide-range Prandtl/Schmidt number power spectrum of optical turbulence and its application to oceanic light propagation
• Scintillations of optical vortex in randomly inhomogeneous medium

Cited by in corpus (1)

• Experimental verification of phase discontinuities induced scintillation enhancement under weak perturbations