Abstract
The use of zone plates in optical alignment and displacement measurement is discussed. A simple theory of positioning using two coherent wavefronts is proposed. A few examples, already described in the literature as well as new ones, are presented as an illustration of the theory. The application of the specific case of the off-axis cylindrical zone plate (so-called parabolic zone plate) and off-axis conical zone plate for sensing the motion along a straight line parallel and inclined to the hologram plane is established. There are also adduced results of simple experiments supporting the analysis.
© 1990 Optical Society of America
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