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We verify the existence of scintillation enhancement by measuring thescintillation index of a beam composed of two coherent Gaussian vortex beamswith $\pm 1$ topological charges propagating through thermally inducedturbulence. Further experimental research based on the reference waveinterferometric method demonstrates that this phenomenon is caused by thecombined effect of a screw dislocation and an infinitely extended edgedislocation, namely the impact of an anisotropic dislocation. The experimentalresults indicate that the anisotropic dislocation is more sensitive to weakperturbations than an isotropic screw dislocation and an infinitely extendededge dislocation, which means the anisotropic dislocation has potential forweak perturbation measurement. This phenomenon is instructive in further phasediscontinuity research.

Experimental verification of phase discontinuities induced scintillation enhancement under weak perturbations