Hologram Structure Research Articles

Wavefront-linearization in construction of computer-generated holograms

The application of computer-generated holograms for 3-D information handling requires reconstructions of image details at finite distances from the hologram plane. To calculate the hologram structure Huygens' principle may be used. To treat this problem in an alternative mathematical way a linearization was introduced. The effects of such a procedure are evaluated and illustrated with analytical and optical reconstructions.

Computer-generated holograms: structure manipulation

It is possible to manipulate the structure of computer holograms. Because these holograms are produced synthetically, we are able to influence some parameters directly. In order to demonstrate this flexibility, some situations were considered: A specific modulation technique (two-carrier procedure) was chosen together with some specific types of manipulation (carrier profile and partial inversion). The effects are described analytically and illustrated by experiments.

Computer-generated Holograms for Testing Optical Elements: Error Analysis and Error Compensation

When generating wavefronts by synthetic holograms several sources of error have to be considered. In this paper two sources are analysed. The first is the binarization of the hologram structure; a quantitative estimate is given for two typical cases. The second is distortion caused by the graphic device applied to generate the hologram diagram. Several techniques in recording and compensating for these errors are described. It is shown that a dual synthetic hologram exhibits special advantages. A compromise has to be made in reducing both of these errors. Reducing the errors caused by binarization increases errors caused by distortions in the hologram diagram and vice versa.

On the relation between three-dimensional hologram and object structures

On the relation between three-dimensional hologram and object structures

The Borrmann effect and extinction in holography

The structure of holograms recorded in a three-dimensional photosensitive medium, is a combination of ideal three-dimensional periodics. By reconstruction of the images of those holograms phenomena of abnormal transmission and extinction were observed, i.e. effects characteristic for diffraction of X-rays in ideal crystals.