Birefringent interference polarizer
First Claim
1. A method of making a birefringent interface polarizer comprising the steps of:
- providing at least first and second polymeric materials having respective nonzero stress optical coefficients,coextruding said first and second polymeric materials in multiple alternating layers in which said layers increase in thickness to produce a player thickness gradient, andstretching said layers such that said first and second polymeric materials become oriented and produce a refractive index mismatch in a first plane which is different from the refractive index mismatch between said first and second polymeric materials in a second plane normal to said first plane.
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Abstract
A birefringent interference polarizer which may be fabricated from readily available materials using established coextrusion techniques is provided. The polarizer has a level of light absorption near zero and can be fabricated to polarize and reflect light of specific wavelengths while transmitting light of other wavelengths. The polarizer includes multiple alternating oriented layers of at least first and second polymeric materials having respective nonzero stress optical coefficients which are sufficiently different to produce a refractive index mismatch between the first and second polymeric materials in a first plane which is different from the refractive index mismatch between the first and second polymeric materials in a second plane normal to the first plane. The refractive index mismatch in the first plane is preferably at least 0.03.
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Citations
11 Claims
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1. A method of making a birefringent interface polarizer comprising the steps of:
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providing at least first and second polymeric materials having respective nonzero stress optical coefficients, coextruding said first and second polymeric materials in multiple alternating layers in which said layers increase in thickness to produce a player thickness gradient, and stretching said layers such that said first and second polymeric materials become oriented and produce a refractive index mismatch in a first plane which is different from the refractive index mismatch between said first and second polymeric materials in a second plane normal to said first plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification