A method includes illuminating a first optical element with an illumination beam to generate a beam of interest and noise from the first optical element. The first optical element is a master copy to be replicated. The method also includes recording in a first recording medium an interference pattern between the beam of interest and a reference beam. The first recording medium is positioned in an optical path of the beam of interest and outside an optical path of the noise. The method further includes illuminating the recorded interference pattern in the first recording medium with a conjugate of the reference beam to generate a conjugate of the beam of interest. The method additionally includes replicating the first optical element in a second recording medium by recording in the second recording medium an interference pattern between the conjugate of the beam of interest and a conjugate of the illumination beam.

A method includes illuminating a first optical element with an illumination beam to generate a beam of interest and noise from the first optical element. The first optical element is a master copy to be replicated. The method also includes recording in a first recording medium an interference pattern between the beam of interest and a reference beam. The first recording medium is positioned in an optical path of the beam of interest and outside an optical path of the noise. The method further includes illuminating the recorded interference pattern in the first recording medium with a conjugate of the reference beam to generate a conjugate of the beam of interest. The method additionally includes replicating the first optical element in a second recording medium by recording in the second recording medium an interference pattern between the conjugate of the beam of interest and a conjugate of the illumination beam.

A replication method for producing a hologram copy by simultaneous exposure of a master hologram and a copy carrier comprising a photosensitive material is provided. The contact body is brought into contact with the copy carrier during the exposure, the contact body and the copy carrier directly touching one another in a part through which exposure light is radiated during the exposure. The contact body is transparent to the exposure light, and the refractive index of the contact body is matched to the refractive index of the copy carrier. Also provided is a device for realizing the replication method.

A replication method for producing a hologram copy by simultaneous exposure of a master hologram and a copy carrier comprising a photosensitive material is provided. The contact body is brought into contact with the copy carrier during the exposure, the contact body and the copy carrier directly touching one another in a part through which exposure light is radiated during the exposure. The contact body is transparent to the exposure light, and the refractive index of the contact body is matched to the refractive index of the copy carrier. Also provided is a device for realizing the replication method.

A method for replicating a hologram in a light-sensitive composite web comprises providing a master element comprising a substrate body and at least one master hologram, applying a light-sensitive composite web on a surface of the master element, exposing the master element in order to replicate the at least one master hologram into the light-sensitive composite web and detaching the exposed composite web from the master element. The method also comprises the temporary application of an optical adhesive film between the light-sensitive composite web and the surface of the master element. The optical adhesive film imparts optical contact between the master element and the light-sensitive composite web during the exposure. Another method for replicating a hologram in a light-sensitive composite web comprises using an input coupling element, wherein an optical adhesive film is introduced between the composite web and the input coupling element.

A display panel (1) comprising a body of optical material, the body having at least one optical image recorded therein in an encoded manner, wherein the image is selectively reconstructable and viewable (5, 6, 7) by illuminating the panel (1) using at least one light source (3a, 3b, 3c) under selected illumination conditions, wherein the image is reconstructable and viewable (5, 6, 7) such that at least one first optical property or parameter of the reconstructed image (e.g. its geometry, position in space, colour, its dynamic appearance) is selectable in value from amongst variable values of the at least one first optical property or parameter, or whose value is actively modifiable over time, as a function of or in dependence on the value of at least one second optical property or parameter of the illumination conditions of the at least one light source (e.g. its/their position(s) or spacing(s) relative to the panel (1), its/their colour, brightness/optical intensity, polarisation, direction of light ray propagation, application of a scanning technique to illuminate the panel (1)) which is selectable from amongst variable values thereof or which is actively modifiable in value over time.

A device for continuously replicating a hologram has a coating module to coat a liquid photopolymer onto a first carrier film, a lamination module to apply a second carrier film to the first carrier film coated with the photopolymer to obtain a photopolymer composite including a liquid photopolymer layer between two carrier films, an exposure module having a light source, and a master element with a master hologram to be replicated, and a fixing module to cure the replicated hologram in the photopolymer composite. The master element is axially rotatably mounted, and the exposure module is designed to bring the photopolymer composite in optical contact with the master element, while the light source exposes the master hologram to obtain a replicated hologram in a region of the photopolymer composite.

A holographic optics module having a main body having a first surface, and two or more area elements each having a holographic structure is provided, wherein the two or more area elements are arranged on the first surface of the main body such that they form a coherent area that provides a predetermined optical function.

A method for continuously replicating a hologram by a device having a coating module, a lamination module, an exposure module and a fixing module involves coating a first carrier film with a liquid photopolymer using the coating module, applying a second carrier film to the coated first carrier film using the lamination module to obtain a photopolymer composite including a liquid photopolymer layer between two carrier films, bringing a region of the photopolymer composite in contact with an axially rotatable master element including a master hologram to be replicated in the exposure module, and exposing the region of the photopolymer composite to a light source, such that the master hologram is replicated on the photopolymer composite, and curing a replica hologram contained in the liquid photopolymer in the fixing module.

The invention relates to techniques for producing a holographic optical element (HOE) by replication of a master HOE. In particular, the invention relates to techniques for flexibly adjusting the diffraction efficiency of the HOE. An adjustable optical element (54) can be used to modify the intensity and/or the polarisation of light during the exposure process.