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The order of a Bessel light beam propagating along the optical axes of a uniaxial crystal can be changed by two due to the influence of crystal anisotropy on beam propagation. This effect occurs because of spin-orbit coupling in crystal-traveling optical field and it is interesting for generation of high-order Bessel beams possessing optical vortices. If the input Bessel beam is apertured, the order-conversion...
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