Image Distortions in Display Holograms

Paper presented at a Conference on “Holographic Measurement, Speckle and Allied Phenomina” organized jointly by the Holographic Group of The Royal Photographic Society and the Central Electricity Generating Board, 16-17 April 1985 at the CEGB Headquarters in London, England.

Abstract

The fidelity of reconstruction of 3-dimensional images by reflection and transmission holograms is investigated, concentrating on the measurement and theoretical modelling of large-scale geometric distortions in holograms illuminated by white or monochromatic light. Variable parameters include: recording and replay wavelengths; object position at recording; emulsion thickness and refractive index; replay light-source angle and distance; presence of a glass substrate, its thickness and refractive index. Holograms were recorded on Agfa 8E56HD photographic plates, and measurements made of image-point directions as a function of position on the hologram, revealing considerable image distortions even for modest changes in parameter values between recording and replay. The results are accurately modelled by the theory, which gives numerical values for point-by-point image positions, without any resort to paraxial approximations.

Notes

Paper presented at a Conference on “Holographic Measurement, Speckle and Allied Phenomina” organized jointly by the Holographic Group of The Royal Photographic Society and the Central Electricity Generating Board, 16-17 April 1985 at the CEGB Headquarters in London, England.