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US 8,658,332 B2Granted
Photopolymer media with enhanced dynamic range
AssigneeAkonia Holographics LLC
InventorFredric R. Askham
Life of this patent
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Abstract
Dynamic range enhancing dopants for photopolymeric media are described. Also described are optical articles using these dopants and methods for making such optical articles.
Claims16
A holographic storage medium comprising:
- a support matrix;
- a photoactive monomer;
- a photoinitiator;
- a dynamic range enhancing dopant (DRED) including a radical trap group and an immobilizing group, wherein;
- the DRED is present in an amount of less than 0.72 wt %;
- the radical trap group is capable of covalently attaching to a growing polymer chain formed from the photoactive monomer;
- the immobilizing group is covalently attached to the support matrix;
- and
- the holographic storage medium has an M/# per 200 μm medium at least 1.5 times the value of the same holographic storage medium without the DRED.
6 more elements
A method of recording to a holographic storage medium comprising:
- synthesizing the holographic storage medium, said synthesizing the holographic storage medium including:
- synthesizing a support matrix, said synthesizing a support matrix including covalently attaching a DRED to the support matrix, wherein:
- the DRED is present in an amount of less than 0.72 weight percent;
- the DRED includes a radical trap group;
- and
- the holographic storage medium has an M/# per 200 μm medium at least 1.3 times the value of the same holographic storage medium without the DRED;
- recording holographic data in the holographic storage medium by polymerizing a photoactive monomer to create a growing polymer chain in the holographic storage medium;
- and
- covalently attaching the growing polymer chain to the radical trap group.
6 more elements
Dependencies are inferred from the claim text.