The paper deals with an iterative algorithm for design diffractive optical elements capable of forming light fields with longitudinal periodicity and modal composition. In addition, the conditions are specified under which the beam transverse intensity distribution, which is dependent on the azimuth angle and lacking radial symmetry, undergoes rotation as the beam propagates along the axis, making an integer number of revolutions per period.
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Kotlyar et al. (1997) studied this question.
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