Colour holography – state of the art

H. Bjelkhagen
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The state of the art of colour holography is presented. The laser wavelength selection issue is investigated through computer simulation, showing that more than three wavelengths are needed for accurate colour rendition in holograms. In addition, the recording material is very important for creating high-quality colour holograms. The demand on the material and suitable products currently on the market are covered. The future of colour holography is highly dependent on the availability o improved panchromatic recording materials. Recording colour holograms, either directly or by computer, as well as digital printing of such holograms are mentioned. The light sources for displaying the holograms are important. Small laser diodes as well as powerful white LEDs and OLEDs with very limited source diameters are important for colour holography to improve image quality over today’s commonly used halogen lights.