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Proceedings Paper

Holofos: an optimized LED illumination system for color reflection holograms display
Author(s): Andreas Sarakinos; Nikos Zervos; Alkiviadis Lembessis
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Paper Abstract

True color reflection holograms can be successfully recorded by exposing panchromatic holographic plates to 3 or more LASER beams of suitable wavelengths. Traditional halogen spotlight illumination of color holograms relying on reflection holograms’ Bragg diffraction sampling capabilities has many drawbacks. This kind of illumination, especially for a broadband hologram, results in heightened levels of chromatic dispersion and blurring of image points far from the hologram’s surface. On the other hand, by intensity mixing of selected narrow band LEDs with peak wavelengths matched to those used during recording, high quality reproduction of deep color holograms can be achieved. In this paper we will present the Holofos LED RGB and RGBW color hologram illumination devices. These devices have a wide color gamut achieved by precision, digitally controlled, RGB intensity mixing at pre-selected wavelengths. Dichroic and refractive optics combine the RGB or RGBW LEDs’ beams into quasi point-source output beam of uniform color cross section. A quantitave spectro-radiometric characterization of the Holofos devices and resolution tests results using a series of test holograms will also be presented.

Paper Details

Date Published: 1 March 2013
PDF: 9 pages
Proc. SPIE 8644, Practical Holography XXVII: Materials and Applications, 86440I (1 March 2013); doi: 10.1117/12.2003959
Show Author Affiliations
Andreas Sarakinos, Hellenic Institute of Holography (Greece)
Nikos Zervos, Hellenic Institute of Holography (Greece)
Alkiviadis Lembessis, Hellenic Institute of Holography (Greece)

Published in SPIE Proceedings Vol. 8644:
Practical Holography XXVII: Materials and Applications
Hans I. Bjelkhagen; V. Michael Bove Jr., Editor(s)

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