Abstract
A wavelength multiplexing procedure for color transmission volume holograms of diffusing objects recorded in Bayfol® HX200 photopolymer is proposed. For the recording, three lasers of 442 nm, 532 nm and 633 nm, and a Spectralon® diffusing object were used for monochromatic and polychromatic calibration. Monochromatic calibration shows that the maximum index modulation obtained for each wavelength was not enough to give 100% efficiency, although the efficiency values achieved in the case of monochromatic recordings with diffusing objects were high, at around 90% for 633 nm and 532 nm recordings, and 60% for 442 nm. The efficiency values obtained for multiplexed holograms were 19.1% for the 442 nm hologram, 25.9% for the 532 nm hologram and 15.2% for the 633 nm.
Highlights
It is known that there are different applications of holography; it should be highlighted that color reproduction is one of the most important
Reflection-type configurations are appropriate in the case of color reproduction when reconstructed with white light and are the most extended type
In the case of transmission-color holograms, it is necessary to illuminate these devices with the required wavelengths with directions that are used in the recording stage
Summary
It is known that there are different applications of holography; it should be highlighted that color reproduction is one of the most important. The applications involve different fields—for instance, art [1], security holography [2], sensors [3,4], displays [5] and LEDs [6]. These examples show the wide range of color-hologram applications [7]. Reflection-type configurations are appropriate in the case of color reproduction when reconstructed with white light and are the most extended type. There are some techniques (for example, rainbow color holography [8]) which allow their reconstruction using white light
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