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
Original Manuscript: February 3, 1989
Published: November 1, 1990
Zbigniew Jaroszewicz, Vicente Moreno, and Salvador Bara, "Interferometric alignment using parabolic and off-axis conical zone plates," Appl. Opt. 29, 4614-4617 (1990)