The change in the spatial distribution of laser radiation after passing through a spatial light modulator introducing regular two-dimensional amplitude-phase and pure phase modulation in the transverse plane of the beam was experimentally studied. The distance (Talbot distance) at which the two-dimensional transverse structure is reproduced for both modulation modes is determined. A comparison has been made of changes in the parameters of transverse spatial distributions for amplitude-phase-modulated and phase-modulated beams as they propagate. It is shown that the depth of modulation of the intensity distribution of amplitude-phase-modulated radiation is significantly higher than that of phase-modulated radiation, and this difference in contrast is maintained during radiation propagation. The results obtained can be used in problems of generating spatially structured radiation for contactless manipulation of particles in various media. Keywords: spatially modulated beams, two-dimensional light field, spatial light modulator, Talbot effect
42.79.-e Optical elements, devices, and systems
$^1$Moscow State University, Faculty of Physics, Department of Optics, Spectroscopy and Physics of Nanosystems. A 4th year student of the specialty.\
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