1 August 1991 Analysis of the chromatic aberrations of imaging holographic optical elements
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Nonimaging holographic optical elements (HOEs) are currently utilized in head-up displays (HUDs) as combiner elements. The conventional HUD optics is limited in the field of view and in the display brightness. In some cases the performance of the HUD may be improved by the use of imaging (powered) HOEs. In this paper the basic features of the chromatic aberrations of powered HOEs are reviewed. The chromatic and geometric aberrations of the in-line geometry are discussed in detail. The authors show how to realize this geometry using high efficiency volume holograms. In the in-line geometry the diffraction efficiency of a holographic stack is less than 90. The image is always accompanied by a background of undiffracted light. The use of volume holograms enables the designer to maintain an effective in-line geometry while at the same time the image is separated from the background of undiffracted light. The in-line geometry exhibits the smallest chromatic and geometrical aberrations compared with the off-axis configuration.
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Hans Dieter Tholl, Hans Dieter Tholl, Hubertus A. Luebbers, Hubertus A. Luebbers, Christo G. Stojanoff, Christo G. Stojanoff, } "Analysis of the chromatic aberrations of imaging holographic optical elements", Proc. SPIE 1456, Large Screen Projection, Avionic, and Helmet-Mounted Displays, (1 August 1991); doi: 10.1117/12.45440; https://doi.org/10.1117/12.45440

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