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Proceedings Paper

Design of an optimal single-reflective holographic helmet display element
Author(s): Patrice J.H. Twardowski; Patrick Meyrueis
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Paper Abstract

A holographic optical element (HOE) can serve both as an imaging lens and a combiner for the helmet-mounted display. The resulting image is created by points whose geometrical conditions at readout will differ from those at recording, and then severe aberrations occur. Using the method of Hasman and Friesem, the authors design an optimal single reflective holographic helmet display element. This theoretical method is based on an analytic ray-tracing procedure that uses the minimization of the mean-squared difference of the propagation vector components between the actual output wavefronts and the desired output wavefronts. Considering the two-dimensional and monochromatic case, the authors obtain integral equations for the optimal grating vector components that they solve. As an illustration, the grating vector is calculated and the performance of a holographic helmet display with a 16 deg X 16 deg field of view is determined. Spot sizes and distortions at the image plane and the mean-squared difference of the propagation vectors are determined, and the results are compared with the performance of an HOE recorded with a spherical wave and a plane wave.

Paper Details

Date Published: 1 August 1991
PDF: 11 pages
Proc. SPIE 1456, Large Screen Projection, Avionic, and Helmet-Mounted Displays, (1 August 1991); doi: 10.1117/12.45427
Show Author Affiliations
Patrice J.H. Twardowski, Ecole Nationale Superieure de Physique de Strasbourg (France)
Patrick Meyrueis, Ecole Nationale Superieure de Physique de Strasbourg (France)


Published in SPIE Proceedings Vol. 1456:
Large Screen Projection, Avionic, and Helmet-Mounted Displays
Harry M. Assenheim; Richard A. Flasck; Thomas M. Lippert; Jerry Bentz, Editor(s)

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