4 Volume Holography
4.1 Introduction
Until now we have assumed that holograms are either amplitude holograms with amplitude transmission proportional to the original intensity of illumination at the recording stage or phase holograms which, at the reconstruction stage, impose on the reference wave an additional phase proportional to the original intensity of illumination at the recording stage. We have also ignored the finite thickness of the hologram, which can in fact be substantial compared to the spacing of the recorded interference fringes in the hologram. We will discuss the unique properties of thick or volume holograms in this chapter using the coupled wave theory of holographic gratings developed by Kogelnik ...
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