Abstract:
We describe a window assembly (100) comprising: a window pane (102) comprising a glass or plastic sheet; and a layer of holographic recording medium (104) attached to said glass or plastic sheet; wherein said layer of holographic recording medium has recorded within the medium a volume hologram (106) configured to direct light incident onto said glass or plastic sheet to propagate within a thickness of said glass or plastic sheet, preferably to a photovoltaic element (120). In embodiments the volume hologram is fabricated by recording a transmission hologram and shrinking the recorded hologram to convert the transmission hologram to an edge-directing hologram configured to direct light in a direction to be totally internally reflected within the window pane, for example at greater than 40°, 50°, 60°, 70°, 75° or 80° to a normal to the surface of the hologram.
Abstract:
Method for displaying an image being projected from a portable head-worn display comprising steps of emitting a plurality of light beams of different wavelengths (206, 301), directing the plurality of light beams to a scanning mirror (205), modulating in intensity each one of the plurality of light beams in accordance with intensity information provided from the displayed image whereby the intensity is representative of a pixel value within the image, scanning the plurality of light beams in two distinct axes with the scanning mirror (205) to form the image and redirecting the plurality of light beams to the eye using a holographic reflector (204) whereby the redirecting is dependent on the wavelength of the light beam, to create for each light beam an exit-pupil (212, 304) at the eye (210) that is spatially separated from the exit-pupils of the other light beams.
Abstract:
A multiwavelength holographic imaging apparatus uses a frequency converter for converting input tunable coherent light having a wavelength tunable around a wavelength λ2 to tunable output coherent light having a wavelength tunable around a wavelength λΐ5 wherein the image receiver receiving the holographic image is sensitive to the light of wavelength λν The image receiver may not be sensitive to light of wavelength λ2, for example if λ2 is in the infrared spectral region greater than 1.3 microns.
Abstract:
A multi-spectral holographic security marker (2) is made by a novel method according to the invention involving a replay frequency shift to one or more final replay frequencies of a part or parts only of a recorded image plane volume hologram. The marker comprises an optional surface hologram (e.g. 3 ) and an image plane volume hologram (2). The volume hologram is divided into discrete areas (a, b) which have mutually different final replay frequencies. The security information carried by the marker is a combination of the size and shape of those different replay areas together with the hologram content itself which is spread across the different replay areas. If the marker also includes a surface hologram, then that is aligned with the junctions between the replay areas. Preferably one volume hologram replay frequency is in the visible spectrum and the other is in the invisible part of the spectrum (IR or UV).
Abstract:
Un combineur diffractif (10) pour dispositif d'affichage tête haute couleur (18) comprend un premier réseau de diffraction optique (14) configuré pour diffracter, dans une direction de diffraction, de la lumière d'une première longueur d'onde incidente sur le premier réseau selon une direction d'incidence, un deuxième réseau de diffraction optique (16) configuré pour diffracter, dans la même direction de diffraction, de la lumière d'une deuxième longueur d'onde incidente sur le deuxième réseau selon la direction d'incidence. Les premier et deuxième réseaux de diffraction optique sont formés en relief sur une première et une deuxième face opposées du combineur. Le premier et/ou le deuxième réseau est réalisé comme réseau de diffraction optique multiplexe en longueur d'onde et configuré pour diffracter, dans la direction de diffraction, de la lumière d'une troisième longueur d'onde incidente le premier et/ou deuxième réseau de diffraction optique selon la direction d'incidence.
Abstract:
A volume holographic imaging system, apparatus, and/or method enables the projection of a two-dimensional (2D) slice of a four- dimensional (4D) probing object A 4D probing source object is illuminated to emit or scatter an optical field A holographic element having one or more recorded holograms receives and diffracts the optical field into a diffracted plane beam having spectral information A 4-ftelecentπc relay system includes a pupil filter on the relayed conjugate plane of the volume hologram and images the pupil of the volume hologram onto the front focal plane of the collector lens A collector lens focuses the diffracted plane beam to a 2D slice of the 4D probing source object The focused 2D slice is projected onto a 2D imaging plane The holographic element may have multiple multiplexed holograms that are arranged to diffract light from the corresponding slice of the 4D probing source object.
Abstract:
Disclosed are methods and systems for displaying images, and for implementing volumetric user interfaces. One exemplary embodiment provides a system comprising: a light source; an image producing unit, which produces an image upon interaction with light approaching the image producing unit from the light source; an eyepiece; and a mirror, directing light from the image to a surface of the eyepiece, wherein the surface has a shape of a solid of revolution formed by revolving a planar curve at least 180° around an axis of revolution. Another exemplary embodiment provides a method for implementing a floating-in-the-air user interface, including displaying a first image in a display space of a first floating-in-the-air display, inserting a real object into the display space of the first floating-in-the-air display, locating a location of the real object within the display space of the first floating-in-the-air display, locating the real object in the display space, and providing the location as input to the floating-in-the-air user interface.
Abstract:
There is provided a user interface for a portable electronic apparatus, the user interface comprising a holographic image provider (100) for use in providing a at least one holographic image (110, 120) by edge-lighting, the holographic image provider comprising a at least one holographic image, the at least one holographic image selectively viewable as a user interface icon (115, 125) by using at least one respective reconstruction beam (140a, 140b).
Abstract:
The invention relates to a method for recording data in a holographic recording medium (14) in a holographic data storage system,. This method comprises the steps of: - recording a first hologram (Hl, Hl ') through a first side (141) of said holographic recording medium, - rotating said holographic recording medium (14), - recording a second hologram (H2, H2') through a second side (142) of same holographic recording medium.
Abstract:
A holographic interaction device is described. In one or more implementations, an input device includes an input portion comprising a plurality of controls that are configured to generate signals to be processed as inputs by a computing device that is communicatively coupled to the controls. The input device also includes a holographic recording mechanism disposed over a surface of the input portion, the holographic recording mechanism is configured to output a hologram in response to receipt of light, from a light source, that is viewable by a user over the input portion.