Tunable Optical Filter and Method of Manufacture Thereof
First Claim
1. A tunable optical filter comprising:
- first and second end substrates, each end substrate having an inner parallel surface arranged toward each other, said inner parallel surface covered by an electrode layer and a reflecting layer; and
an electro-optic ceramic substrate having first and second parallel surfaces arranged between said first and second end substrates, said electro-optic ceramic substrate no more than 160 μ
m thick;
whereby a voltage imposed on said electro-optic ceramic substrate by said electrode layers on said inner parallel surfaces of said first and second end substrates effectively controls an optical distance between said reflecting layers on said inner parallel surfaces of said first and second end substrates.
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Abstract
A tunable optical filter is formed in the structure of an etalon. A thin electro-optic ceramic substrate is fixed between two end substrates. Each end substrate has an inner parallel surface toward said electro-optic ceramic substrate covered by an electrode layer and a reflecting layer. An adhesive which attaches the electro-optic ceramic substrate to each first and second end substrates has a consistency so as to avoid stress on the electro-optic ceramic substrate. A voltage imposed on the electro-optic ceramic substrate by the electrode layers on the inner parallel surfaces of the first and second end substrates effectively controls an optical distance between the reflective coating layers on the inner parallel surfaces of the first and second end substrates of the etalon structure. The electro-optic ceramic substrate is preferably PMN-PT ((1-x)Pb (Mg⅓ Nb⅔) O3−x—Pb Ti O3) and no more than 160 μm thick.
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Citations
5 Claims
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1. A tunable optical filter comprising:
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first and second end substrates, each end substrate having an inner parallel surface arranged toward each other, said inner parallel surface covered by an electrode layer and a reflecting layer; and an electro-optic ceramic substrate having first and second parallel surfaces arranged between said first and second end substrates, said electro-optic ceramic substrate no more than 160 μ
m thick;whereby a voltage imposed on said electro-optic ceramic substrate by said electrode layers on said inner parallel surfaces of said first and second end substrates effectively controls an optical distance between said reflecting layers on said inner parallel surfaces of said first and second end substrates. - View Dependent Claims (2, 3)
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4. A method of manufacturing a tunable optical filter comprising:
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depositing an electrode layer and a reflective coating layer on a flat surface of first and second end substrates; polishing an electro-optic ceramic substrate to no more than 160 μ
m thick with first and second parallel surfaces; andarranging said first and second end substrates so that said flat surface of each end substrate faces each other with said electro-optic ceramic substrate therebetween. - View Dependent Claims (5)
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Specification