Now we know the optimal taper z„ and the additional phase distribution at the maximum distance yn = 0 and at the minimum one y*. By minimizing the penalty function [16] we searched the additional phase distributions for intermediate values of distance: D C [Dmin; DmaJ. Taking into account the discrete (non-continuous) form of the field distribution, it was not quite clear that we really could find it. Numerical results show that it depends on the number of steps N. For N = 10, used in our calculations, it was possible to find the additional phase distribution for each intermediate point with an accuracy of e < 10'5. The maximum range of distance changes for various values of the parameter r0 and collection efficienciesr) is shown in fig.8. The higher the value of the parameter r0, the wider the range of distance changes.
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