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The polarisation-dependent effect of the astigmatic transformation of vortex beams focused perpendicular to the axis of a uniaxial crystal is investigated theoretically and experimentally. The dependence of the transformation on the polarisation state of a beam incident on a crystal was studied numerically in detail, showing the influence of the polarisation state on the individual electric field...
We investigate the effects of changing the power of a Gaussian laser beam on the motion of light-absorbing microparticles trapped in the beam region. Laser trapping of such particles was due to the action of so-called photophoretic forces. In addition, we demonstrate the possibility of controlled movement of trapped carbon nanoparticle agglomerations, both in the direction of propagation of the laser...
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