Holographic waveguide heads-up display for longitudinal image magnification and pupil expansion

Colton M. Bigler, Pierre Alexandre Blanche, Kalluri Sarma

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The field of view of traditional heads-up display systems is limited by the size of the projection optics. Our research is focused on overcoming this limitation by coupling image-bearing light into a waveguide using holographic elements, propagating the light through that waveguide, and extracting the light several times with additional holographic optical elements. With this configuration, we demonstrated both longitudinal magnification and pupil expansion of the heads-up display. We created a ray-trace model of the optical system to optimize the component parameters and implemented the solution in a prototype that demonstrates the merit of our approach. Longitudinal magnification is achieved by encoding optical power into the hologram injecting the light into the waveguide, while pupil expansion is obtained by expanding the size of the hologram extracting the light from the waveguide element. To ensure uniform intensity of the image, the diffraction efficiency of the extracting hologram is modulated according to the position. Our design has a 12° × 8° field of view at a viewing distance of 10 in. (250 mm), with infinite longitudinal magnification and a 1.7× lateral pupil expansion.

Original languageEnglish (US)
Pages (from-to)2007-2013
Number of pages7
JournalApplied Optics
Volume57
Issue number9
DOIs
Publication statusPublished - Mar 20 2018

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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