Optical device with negative thermal expansion substrate and uses therefor

a technology of thermal expansion substrate and optical device, which is applied in the direction of optical elements, cladded optical fibres, instruments, etc., can solve the problems of cte curves that exhibit considerable hysteria, material negative mean lattice expansions that do not require microcracking for negative bulk ceramic ctes are even more limited, and high porosity bodies are generally not useful for industrial applications. , to achieve the effect of reducing particle size, preventing microcracking
US20010021292A1Inactive Publication Date: 2001-09-13CORNING INC
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Patent Information

Authority / Receiving Office
US Β· United States
Patent Type
Applications(United States)
Current Assignee / Owner
CORNING INC
Publication Date
2001-09-13
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

Negative thermal expansion materials, methods of preparation and uses therefor are disclosed. The materials are useful for negative thermal expansion substrates, such as those used for optical fiber gratings.
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Description

[0001] This application claims priority to U.S. application Ser. No. 09 / 305763, filed on May 5, 1999, which claims priority to Provisional U.S. Application No. 60 / 086,053, filed on May 19, 1998, the contents of which are herein incorporated by reference.

[0002] The invention pertains to negative thermal expansion materials, devices made therefrom, and methods of making the materials. More particularly, the present invention concerns compositions including zirconium phosphate tungstates, which can be used to make substrates for athermalized optical fiber reflective grating devices.

[0003] Negative thermal expansion (contraction with increasing temperature) is an unusual and potentially useful property for a solid material, and very few crystalline materials possess strongly negative expansions over an extended temperature range. Materials that exhibit a negative expansion due to extensive microcracking, by virtue of a negative coefficient of thermal expansion ("CTE") along at least one...

Claims

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