Infrared (10.6-µm) dynamic holograms are obtained on a recording medium consisting of a thin oil film on a glass substrate. Reconstruction with visible light (0.63 µm) permits copying the initial hologram on a photographic plate. Any subsequent displacement of the object modifies the corresponding reconstructed wave at the recording medium, thereby creating a characteristic visible interferogram. Analysis of the double image in copy holograms together with fringe localization and visibility did not show stringent setup conditions. Experimental results are well related to various objects and displacements while the long wavelength (≃ 10 µm) used offers the advantage of large displacements or wavefronts deformation measurability and considerably decreases the setup sensitivity to vibrations.

© 1986 Optical Society of America

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