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URL: http://opsi.ir/article-1-1106-en.html
After propagating through the turbulent atmosphere the wave frount distorted, which causes the degradation of performance in an optical system. An optical vortex, called a phase singularity, is a screw dislocation where the amplitude goes to zero and the phase is undefined in a complex optical field. Around the vortex core, the phase increase by a with the integer m being referred to as the topological charge of the vortex. Therefore, a vortex can be positive or negative. If the phase increment around the vortex is linear with the azimuthal this vortex is called a canonical vortex. Otherwise, it is called a noncanonical vortex. One way to improve the performance of optical system is detection and simulation of optical vortex. At the article we have simulated a noncanonical vortex by use of Hadgin method at Labview software. The vector field G according to the circulation D that is proved by Hadgin interpolation method. The result of this computation D is a distribution of the topological charges of the optical vortex. With the plots of circulation D for a noncanonical vortex, it can show the peak value at (&mu ,&nu)=(0,0) for D as a function of &alpha , &beta . The peak is positive or negative. The jump at &alpha=&pi/2 is due to the change in the topological charge of the vortex that is location of noncanonical vortex
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