An essential aspect of diffractive optics is the inverse problem of how to proceed from the desired wave field in space to the design of the diffractive element which can be used to form this field. The subject is treated under the consideration of various approximations. This approach defines digital holography as a subset of diffractive optics. Coding theory is a central topic in digital holography. Coding methods and predictions of diffraction efficiency are discussed.
Frank Wyrowski, Frank Wyrowski,
"Digital holography as a useful model in diffractive optics", Proc. SPIE 1507, Holographic Optics III: Principles and Applications, (1 September 1991); doi: 10.1117/12.47034; https://doi.org/10.1117/12.47034