Optical filter and method for making the same
AssigneeU.S. Army Research Laboratory ATTN: RDRL-LOC-I
InventorThomas C. Parker
Life of this patent
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Abstract
An optical filter for use in high temperature and rapid changing temperature environments, and method of making the same is provided. The optical filter includes a substrate and a filter layer disposed on the substrate. The filter layer has a porous columnar micro-structure configured to decouple the thermal expansion stress between the substrate and the filter layer when the optical filter is subjected to high temperature. The filter layer may be formed of a material conducive to physical vapor deposition, such as metallic oxide. The filter layer is deposited onto the substrate at an angle.
Claims16
An optical filter comprising:
- a substrate;
- at least one filter layer disposed on the substrate, the at least one filter layer having a porous columnar micro-structure configured to decouple the thermal expansion stress between the substrate and the at least one filter layer.
A method of making an optical filter having a porous columnar micro-structure configured to decouple the thermal expansion stress between the substrate and the filter layer when the optical filter is subjected to high temperature, the method comprising the steps of:
- providing a substrate;
- depositing a first material onto the substrate utilizing physical vapor deposition and wherein the first material is deposited at an angle between 89 and 5 with respect to the substrate.
Dependencies are inferred from the claim text.