Abstract. The diffraction light field is studied by the numerical calculations of Kirchhoff-Fresnel integral and Fourier analysis. Based on combination of these methods, the condition of an axial optical vortex generation in a quasi-plane wave by the special case of a phase addition in the cross-section of a beam is founded. Amplitude and phase structures of the beam synthesized like a singular one are analyzed using computer simulation. The coefficient of conversion of an axial optical vortex beam from the quasi- plane wave is defined by the ratio of intensities and reaches 65 % in the far field diffraction zone. Offered are a simple original technique for the experimental realization of the necessary phase addition to the wave for the axial optical vortex beam synthesis and a light “lock” for trapping the absorbing microparticles by using two inclined mirrors.

Keywords: optical vortex, dislocation of a wave front, singular beam, diffraction, synthesis of a vortex beam, mirror.

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