Systems and method for eye tracking are provided. In some embodiments, the eye tracking system includes a light source configured to generate light and project the light toward an object in a field of view, a detector configured to receive reflected portions of the light from the field of view in order to image the object, and a combiner including a volume grating configured to direct light reflected from different points in a field of view to the light detector. The volume grating includes a plurality of portions along a first area and each of the portions comprising a unique k-vector that is dependent on a respective portion of the field of view.

Various holographic films for recording multicolor volume holograms, especially full color volume reflection holograms, and to manufacturing techniques for such film, and to corresponding methods of recording multicolor and full-color volume, in particular volume reflection holograms. We describe a holographic film for recording a multicolor volume hologram, the film including: a carrier; a first photosensitive recording layer sensitive to one or both of red and green laser light; and a second photosensitive recording layer sensitive to blue laser light. Both the first and second photosensitive recording layers include silver halide and have a grain size of less than 30 nm, and at least one of the photosensitive recording layers has a thickness of greater than 3 ?m and less than 5 ?m.

A holographic imaging system for capturing and displaying a high-resolution and polychromatic hologram, the holographic imaging system comprising: a plurality of monochromatic coherent light sources, configured to generate a plurality of monochromatic light input wavelengths; a polarization preserving diffuser configured to receive the plurality of monochromatic light input wavelengths at a first end of the polarization preserving diffuser, and further configured to provide a polychromatic output at a second end of the fiber; and a diffractive optical element configured to receive polychromatic light from the second end of the fiber.