| http://www.w3.org/ns/prov#value | - Such operation is performed by a retardance control circuit 50 in which the retardance of cell 40 is contrained to lie within a single region, e.g., [nL, (n+1/2)L] or [(n+1/2)L, (n+1)L], where n is an integer (which may be 0) and L is defined, as above, as the wavelength of an input light beam.
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