A filter combination consisting of a lens and two pure phase filters, situated in the two focal planes, is discussed. This element, which we call a tandem component, apparently does not absorb any light; in other words, the tandem component is capable of shaping wave fronts with 100% efficiency independent of the object function. We describe a basic configuration and outline its space-variant system properties. The tandem component can be used for many of the standard applications of computer-generated holograms and possibly for some new types as well in view of its space variance.
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Hartmut Bartelt (1984) studied this question.
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