Modelling of a composite waveguide holographic display

Optical designs of waveguide-type augmented reality displays are investigated. Displays based on volume phase holograms notable for their small size, large exit pupil and high transmittance both in the projected image channel direct vision channel. However, with an increase aperture, field view working spectral range, spread values beam angle incidence wavelength increases when solving diffraction problem at different points hologram surface which imposes restrictions spatial resolution efficiency. To overcome this phenomenon, it is proposed to use a composite represents grating divided into zones independently varying parameters fringes tilt, shape, holographic layer thickness refraction index modulation depth. We propose algorithm that allows ray tracing through recorded by two coherent point sources using auxiliary aspherical mirror. The initial recording scheme performed error function minimization orthogonal descent golden section methods. Based results obtained, directional vectors diffracted calculated Welford equation. Using results, efficiency computed Kogelnik’s coupled wave theory. algorithms implemented Zemax Optics Studio software. application element tools operation modeling shown example display operating range 510–530 nm 7°36ʹ × 5°48ʹ diameter 8 mm. It solutions make possible 3.45 times. At same time, 12.7 % across 0ʹ44ʺ–1ʹ6ʺ. one create higher brightness as well uniformity characteristics view.