Volume Hologram
Volume holograms are holograms where the thickness of the recording material is much larger than the light wavelength used for recording. In this case diffraction of light from the hologram is possible only as Bragg diffraction, i.e., the light has to have the right wavelength (color) and the wave must have the right shape (beam direction, wavefront profile). Volume holograms are also called "thick holograms" or "Bragg holograms".
Read more about Volume Hologram: Theory, Manufacturing, Bragg Selectivity, Applications of Volume Holograms
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—Mark Twain [Samuel Langhorne Clemens] (1835–1910)