Systems, devices, and methods for side lobe control in holograms
AssigneeNorth Inc.
InventorRobin W. Tsen
Life of this patent
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Abstract
Systems, devices, and methods for side lobe control in holograms are described. The magnitude of the side lobes of a hologram depends on the distribution of refractive index modulation (Δn), therefore control of side lobe magnitude may be achieved by controlling the distribution of Δn. The distribution of Δn may be controlled by replicating a hologram from a master with two reference beams, where the wavelength and angle of each reference beam, the playback angle of the master hologram, and the thickness of the master hologram, the copy holographic recording medium (HRM), and the recording substrate are carefully chosen to achieve a pattern of meta-interference within the HRM that matches the desired distribution of Δn.
Claims18
A method of producing a hologram with controlled side lobes, the method comprising:
- providing a recording substrate comprising a first surface and a second surface opposite the first surface;
- mounting a master hologram on the first surface of the recording substrate;
- mounting a holographic recording material (“HRM”) on the second surface of the recording substrate;
- replicating the master hologram within the HRM with at least two reference beams to produce a hologram with controlled side lobes, wherein the hologram with controlled side lobes comprises a first surface and a second surface opposite the first surface;
- and
- dismounting the hologram with controlled side lobes from the recording substrate.
Dependencies are inferred from the claim text.