DIRECTIONAL LIGHT FILTER AND HOLOGRAPHIC PROJECTOR SYSTEM FOR ITS PRODUCTION A photosensitive optical body is exposed by a diverging three-dimensional standing wave interference pattern generated by a holographic projector system. The projector system, using binary optics, creates a diverging lattice of hexagonal or square rod-like intensity maxima extending through the optical body. After the standing wave image is recorded and fixed, the optical body will contain a honeycomb-like grid or pattern that will cause either an absorption or a refractive index modulation effect on light that differs in incidence to the direction of normal propagation through the created channels to a focus or convergence point. This produces either a volume-absorption hologram or a volume-phase hologram (transmittance function modulated by the permittivity ¢index of refraction!) with such properties as depth of focus, high resolution, and a one-way (directional perspective) and anti-glare effect with reduced diffraction. Unique photosensitive aromatic diazo compounds which possess high thermal stability and soluble in non-polar solvents are provided. In the volume-absorption hologram, the compounds react with couplers within the optical body during development to form azo dye in the areas corresponding to destructive interference during exposure. While chiefly intended for use in eyeglass lenses, the optical body may also find use in telescopes, detectors, film and video cameras, and various other optical devices. The holographic projector system also affords a production method of writing highly-corrected peripheral as well as center-field mesh patterns on planar or non-planar surfaces.
DIRECTIONAL LIGHT FILTER AND HOLOGRAPHIC PROJECTOR SYSTEM FOR ITS PRODUCTION