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Figure 1
Optical parameters of a VLS active grating. is a general point on the grating surface in the ω–ξ plane. A is the source point and O is the grating centre. OA is the central ray entering the VLS grating. B and B1 are image points of varied energies. r1 and r2 are distances from the grating to the source and the image point, respectively. |


journal menu![[Figure 1]](vv5064fig1.jpg)
is a general point on the grating surface in the 


