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The cross-spectral density of coherent Gaussian vortex beams propagatingthrough weak oceanic turbulence is derived from extended Huygens-Fresnelprinciple and Nikishov spectrum. The evolution of a coherent superpositionfield composed of dual Gaussian vortex beams with $+1$ and $-1$ topologicalcharges respectively through weak oceanic turbulence is investigated in z planeand y plane. It is shown that the non-zero separation distance of two beams inx direction enhances the oceanic turbulence effect on interference light field.The variation of intensity distribution in z plane and on the central axis oftwo beams in y plane are both related to the strength of oceanic turbulence,separation distance, propagation distance and waist width. The extrafluctuation of the intensity on the central axis of two beams in y plane leadsto high sensitivity of oceanic turbulence. This characteristic has potentialapplication in non-contact optical tomography of oceanic turbulence strengthalong the beam propagation path by lateral scattering intensity.

Evolution properties of coherent Gaussian vortex beams propagating through weak oceanic turbulence and its application for measurement