Abstract
Thin photosensitive layers prepared by vacuum evaporation have many advantages for high resolution image recording, particularly where they possess an add-on facility. Experiments are described on the optical properties and photosensitivity of halide and oxide layers which illustrate two different approaches to thin layer add-on recording. The use of these layers for image recording and holography is described with particular reference to the various ways in which light induced changes in the optical properties of a layer can be used to produce image contrast or holographic diffraction. A brief survey is given of the possibilities for existing and potential high resolution, add-on thin layer photosystems.

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