| http://www.w3.org/ns/prov#value | - g is a plane, one-dimensional, binary phase grating having a rectangular groove profile and having a duty factor of substantially 1:1; and the optical path difference, H=(N-1)h, is substantially given by H=0.32??+n??, where N is the refractive index of the grating material, h is the grating height, ?? is the wavelength of the light being divided, and n=0, 1, 2 . . . . 11.
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