This paper describes holography from the point of display-use, together with a new technique on wide angle holography, in which reflections by mirrors are applied and the hologram is made in two stages.
In the first stage, an object is recorded holographically in an arrangement in which both the object and a photosensitive material are surrounded by suitable reflecting surfaces (the re-cording of the first hologram.)
After that, the first hologram is put in the same position as was occupied on its record-ing stage and a real image of the object is reconstructed. In this second stage a second pho-tosensitive material is arranged near the real image of the object, on which the real image is recorded holographically as an image hologram (the recording of the second hologram.)
The hologram (the second hologram) made by the above technique has the advantage of being image-type with a wide view angle properties.
Trial experiments showed the feasibility of the new technique.
The method described in this paper may be widely applied not only to get a wide view angle hologram but obtain holograms which have other remarkable characteristics. Thus, the method is applicable, for example, to the following,
1) increase in light intensity of the reconstructed holographic image,
2) super-resolution by the holographic technique,
3) local reference beam holography.
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