This article describes an experimental study of the optical vortex generation with the use of light that was reflected from the combination of two cube-corner reflectors (retroreflectors) and its analysis in far field. The main goal of our research was to confirm the theoretical data from the article. Shearing interferometer was used for optical vortex detection and analysis. Our previous studies were focused on cases with linear polarization forming a polarization vortex. This time we were using light circular polarization to produce an optical vortex with m=2.
This article describes an experimental study of the optical vortex formation using beams reflected from a combination of two cube-corner reflectors with a special interference phase-shifting coating. As predicted earlier, if arranged properly, these cube-corner reflectors create a spatial polarization structure, that can be called an optical vortex, since the plane of oscillations of thе vector E rotates with azimuth variation in the transverse plane. Our previous studies concluded that such configuration works as intended, however only near-field images were obtained. This time we preset experimental results in the far field.
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