We propose an iterative algorithm for computation of the radial phase function of the optical element which formates the light segment along the optical axis and is characterized by the given lenght and the required intensity distribution on the segment. The algorithm is also applicable to computing the multi-focal lens that is the focusator capable of focusing into a set of the light longitudinal segments. It has numerically been shown that the focusators developed on the basis of the proposed method are able to formate the desired intensity distribution to an accuracy of 1% to 10%.
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