The role of the recording material in holographic imaging is reviewed. Following a general classification of holograms into four basic types, the thick and thin amplitude and phase holograms, a discussion is given of the diffraction efficiency and other intrinsic characteristics of each of these types. The effects of zero spread nonlinearities in hologram recording are examined, and the limitations they impose on the usable diffraction efficiency of the various hologram types are discussed. The effect of the recording material modulation transfer function is treated by means of a fictitious mask model which facilitates prediction of the recordable object field and resolution. The noise characteristics of recording media are discussed in terms of their effect on holographic recording. Some examples of noise limitations on holographic information recording by silver halide emulsions are examined, as are the effects of such limitations on the dynamic range of holography. The effects of silver halide grain noise in conventional and holographic recording are compared, showing the conditions under which better performance can be achieved in the latter by a given emulsion. The characteristics of several nonsilver halide hologram recording materials are briefly summarized.
Image recording processes which yield non-absorbing, light-scattering images exhibit characteristics not encountered in conventional photographic processes. Some of these characteristics must be considered in any evaluation of the quality of light-scattering images. One such characteristic is the dependence of the projected image of a light-scattering transparency upon the relative aperture of the projector lens. This effect is examined in the case of a conventional projection system.
The detail-recording characteristics of the Frost thermoplastic xerography process have been examined. A tentative model for this process is proposed, and the usefulness of this model is discussed on the basis of experimental data on the recording of sinusoidal test patterns. An unusual characteristic of the process has been observed and has been elucidated further by measurement of noise spectra.
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