Holographic optical devices for the transmission of optical signals of a plurality of channels
AssigneeYeda Research and Development Co. Ltd.
InventorsAsher Albert Friesem, Yaakov Amitai
Life of this patent
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Abstract
A holographic optical device includes a light-transmissive substrate, a first holographic optical element, and a second holographic optical element that is laterally disposed on the substrate from the first holographic optical element. At least one of the holographic optical elements is a complex diffraction grating that can handle a multiplicity of plane and/or spherical waves arriving from a range of angles, and having a range of wavelengths. Applications for the device include a wavelength division multiplexer/demultiplexer, an image reconstructor, a beam expander/compressor, and a visor/head-up display.
Claims7
A holographic optical device, for the transmission of optical signals of a plurality of channels each of a different wavelength between (a) a plurality of optical transmission paths, one for each channel, and (b) a single optical transmission path for all the channels, comprising:
- a light-transmissive substrate;
- a first holographic optical element carried by said substrate;
- and at least two further holographic optical elements carried by said substrate laterally of said first holographic optical element;
- characterized in that:
- at least one of said holographic optical elements is diffraction grating that can handle a multiplicity of plane waves and/or spherical waves having a range of wavelengths;
- and
- said holographic optical elements include a single hologram associated with said single optical transmission path and having a plurality of optical elements, one for each of said channels and a plurality of holograms, each aligned with one of said plurality of optical transmission paths, and having a single hologram optical element for the channel of the respective path.
Dependencies are inferred from the claim text.