9 September 1994 Stacked volume holograms as light-directing elements
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Proceedings Volume 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII; (1994) https://doi.org/10.1117/12.185391
Event: Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, 1994, Freiburg, Germany
Abstract
Holographic optical elements are utilized in daylighting systems as light directing elements. The holograms can be fabricated on thin foils which are laminated between glass panes. The function of the holograms is limited by dispersion. Especially for large angles of incidence only a small portion of the solar spectrum is diffracted by a single hologram. Thus the redirected sunlight changes color. In this paper we show how the color changes can be minimized by using a stack of volume holograms. Each hologram diffracts a different portion of the solar spectrum into the same direction. The diffracted waves are superimposed in order to generate white light according to the additive color theory. The case of two holograms operating in the blue and red portion of the visible spectrum is analyzed theoretically and realized experimentally. Measurements of the diffraction efficiency as a function of wavelength are presented for different angles of incidence. From these measurements the color performance and the angular sensitivity of the stack is inferred.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans Dieter Tholl, Hans Dieter Tholl, Ralf Kubiza, Ralf Kubiza, Christo G. Stojanoff, Christo G. Stojanoff, } "Stacked volume holograms as light-directing elements", Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185391; https://doi.org/10.1117/12.185391
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