Method for holographic mastering and replication
AssigneeDigiLens Inc.
InventorsMilan Momcilo Popovich, Jonathan David Waldern, Alastair John Grant
Life of this patent
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Abstract
A method for producing holograms with a multiplicity of holographic prescriptions from a single master is provided. A multiplicity of holographic substrates each having a first hologram is stacked on a second holographic recording medium substrate. The first hologram is designed to diffract light from a first direction into a second direction. When expose to illumination from the first direction zero order and diffracted light from each first hologram interfere in the second holographic recording medium substrate forming a second hologram. The second hologram is then copied into a third holographic recording medium substrate to provide the final copy hologram.
Claims20
A method for mastering and replicating holograms, the method comprising:
- a) providing N substrates each containing a first hologram for diffracting incident light from a first direction into diffracted light in a second direction;
- providing a second holographic recording medium;
- and providing a third holographic recording medium;
- b) stacking in sequence the first holograms 1-N onto said second holographic recording medium;
- c) illuminating an external surface of said first holograms 1-N with light of a first polarization in a first direction;
- d) said first holograms 1-N diffracting said light into zero order light in said first direction and diffracted light in said second direction;
- e) said first direction light and said second direction light interfering in said second holographic recording medium to form a second hologram;
- f) placing said second hologram in contact with said third holographic recording medium;
- g) illuminating external surface of said second hologram with light in said first direction;
- h) said second hologram diffracting said light into zero order light in said first direction and diffracted light in said second direction;
- and
- i) said diffracted and zero order light interfering in said third holographic recording medium to form a third hologram.
A method of mastering and replicating holograms, the method comprising:
- a) providing a laser apparatus for forming a first recording beam in a first direction and a second recording beams in a second direction;
- N substrates each containing a first HPDLC mixture;
- a holography photopolymer;
- a copy holographic substrate containing a second HPDLC mixture;
- a HWP;
- and a linear polarizer;
- b) said first and second beams interfering within each said first HPDLC mixture to form a first hologram in each said substrate;
- c) stacking in sequence the linear polarizer, HWP and first holograms 1-N onto a second holographic photopolymer;
- d) illuminating external surface of said holograms 1-N with light of a first polarization in said first direction;
- e) said first holograms 1-N diffracting said light into zero order light in said first direction and diffracted light in said second direction;
- f) said HWF rotating the incident light polarization through ninety degrees into a second polarization;
- g) said polarizer removing residual first polarization light;
- h) said first direction light and said second direction light interfering in said holographic photopolymer to form a second hologram;
- i) placing said second hologram in contact with said copy holographic substrate;
- j) illuminating external surface of said second hologram with light of said second polarization in said first direction;
- k) said second hologram diffracting said light into zero order light in said first direction and diffracted light in said second direction;
- and
- l) said diffracted and first order interfering in said copy holographic substrate to form a third hologram.
Dependencies are inferred from the claim text.