Holograms have been constructed in photopolymer materials which give bright, low-noise images. These holograms are of the volume type and have no surface variations in all but a few special cases. They are constructed in virtually real time and in situ, requiring no processing. Materials sensitive to both uv and blue-green radiation have been used. In this paper, the mechanism of hologram formation is examined. Experimental results on sensitivity, spatial frequency response, particle scattering noise, and nonlinearities are discussed. A few holographic applications of the material are presented.

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This paper describes a new method for the measurement of minute deformations of arbitrary three-dimensional objects, such as might occur due to applied stress. The method is an application of the wavefront reconstruction technique, as developed by Leith and Upatnieks, to the interferometry of three-dimensional diffusely reflecting objects. The theory of wavefront reconstruction is sketched. A detailed theory for the interpretation of the interference phenomena observed in terms of the translations and rotations undergone by a point on the object is presented. Experimental results verifying the method and the theory are shown.

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