5 Holography and Holographic Interferometry via Photopolymer Film 53 Fig. 5.2 Fringe patterns of a clamped circular polycarbonate plate under concentrated central load. (a) 0.25μm central displacement, (b) 0.75μm central displacement, (c) 1.0 μm central displacement, (d) 2.1 μm central displacement 5.5 Conclusion and Discussion A photopolymer film has been proposed to be used for holography and holographic interferometry. The film greatly simplifies the process of producing holograms as the film cannot be overdeveloped and does not require the wet chemistry and processing of the film. The film developing in place allows for holographic interferometry to be performed simply, by not requiring the film to be removed to be developed. The time required for the development of hologram takes a comparable time to the exposure time of traditional holographic films. Bayer has shown that high beam ratios are sufficient [9], but experience has shown that the beam ratios should be tuned to have approximately equal power on the surface of the film to allow for the best results.
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