MODIFIED QUANTIZATION SCHEMES FOR FOURIER-TYPE ARRAY GENERATORS

Phase quantization of diffractive elements usually requires uniformly distributed phase levels in the domain [0,2 pi]. In this paper we disc uss two alternate quantization schemes. In the first one the phases ar e uniformly distributed in a domain [0,phi(o)], with phi(o),<2 pi. The second scheme employs non-equidistant levels in the phase domain [0,2 pi]. Both schemes are useful to reduce quantization errors in diffrac tive elements, without increasing fabrication complexity. (C) 1997 Els evier Science B.V.