Abstract: A method of making a holographic optical element is disclosed. The method comprises the steps of determining the separation between interference pattern planes tangent to surfaces separated by a desired distance which achieves desired optical properties at a given first wavelength and angular orientation of light in a hologram disposed on a curved surface of first shape corresponding to the shape of a curved holographic element. The angular characteristics of exposure to achieve of this separation of planes in a planar analog of the desired curved holographic element is determined. The angles of exposure of interfering light rays to achieve this separation of planes in the planar analog by exposure of a sensitive substantially planar surface at a second wavelength in order to achieve the desired separation of planes and angular characteristics are determined.

Abstract: A laser shield (FIG. 3) for providing ocular protection against laser hazards, while still providing high photopic or scotopic transmittance and good color discrimination is disclosed. This laser shield comprises a holographic optical notch filter mirror (102) having an optical surface such that the angle (104) made by an incoming laser beam (114), which is aimed by the pupil of the user, with respect to the normal of the optical surface is less than the corresponding angle (108) made by the same incoming laser beam (114) with respect to the physical surface of the substrate. This decrease in the effective angle of incidence reduces the spectral shift of the notch (which defines the frequency that is reflected), thereby providing increased protection for the same range of angles of incidence. The holographic mirror optical surface formed can be the analog of a conventional spherical, hyperbolic, parabolic, elliptical or other aspheric mirror.

Abstract: The invention relates to a process for the production of a substrate for an electrically controlled device such as a display screen, said substrate integrating non-linear elements and control elements of the elementary display points. The invention relates to the production of a substrate, in its active part, has non-linear elements associated with each image element and produced from amorphous silicon and, in its peripheral part, polycrystalline silicon controlled elements. Initially the substrate has amorphous silicon layers, the peripheral crystallization being obtained by annealing in a temperature gradient furnace.

Abstract: The invention relates to a process for the production of a substrate for an electrically controlled device such as a display screen, said substrate integrating non-linear elements and control elements of the elementary display points. The invention relates to the production of a substrate, in its active part, has non-linear elements associated with each image element and produced from amorphous silicon and, in its peripheral part, polycrystalline silicon controlled elements. Initially the substrate has amorphous silicon layers, the peripheral crystallization being obtained by annealing in a temperature gradient furnace.