1 March 2013 Holofos: an optimized LED illumination system for color reflection holograms display
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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.
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Andreas Sarakinos, Andreas Sarakinos, Nikos Zervos, Nikos Zervos, Alkiviadis Lembessis, Alkiviadis Lembessis, "Holofos: an optimized LED illumination system for color reflection holograms display ", Proc. SPIE 8644, Practical Holography XXVII: Materials and Applications, 86440I (1 March 2013); doi: 10.1117/12.2003959; https://doi.org/10.1117/12.2003959
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