prov:value
| - The grating of claim 1, wherein said reflective/transmissive lines of the grating are advantageously such that they are defined, in terms of coordinates x,y in the plane of the grating, by the equation S(x,y)=kN where k is a scaling factor, N is an integer and the function S(x,y) is given by: S(x,y)=W(x,y)+P(x,y)+C(x,y) (1) where S(x,y) is the initial phase function
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