Engineered fluoride-coated elements for laser systems
First Claim
1. An element for use in wavelengths less than 200 nm laser systems, said element comprising:
- a substrate,a plurality of periods of fluoride coating materials, each of said periods comprising at least one layer of a high refractive index fluoride material and at least one layer of a low refractive fluoride material,a plurality of layers of an amorphous SiO2 based material selected from the group consisting of amorphous silica, amorphous F-doped SiO2, amorphous N-doped SiO2 and amorphous Al2O3-doped SiO2, wherein one of said layers of amorphous SiO2 is inserted between periods of said fluoride coating materials or between a stack of a plurality said periods,wherein said high refractive index fluoride material has an index in the range of 1.65 to 1.75 and said low refractive fluoride material has an index in the range of 1.35 to 1.45, andwherein the thickness of the amorphous SiO2 layer inserted between the periods of high and low refractive index materials is in the range of 5 nm to 75 nm.
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Abstract
The invention is directed to elements having fluoride coated surfaces having multiple layers of fluoride material coatings for use in laser systems, and in particular in laser systems operating at wavelength <200 nm. In a particular embodiment the invention is directed to highly reflective mirrors for use in wavelengths <200 nm laser systems. The invention describes the mirrors and a method of making them that utilizes a plurality of periods of fluoride coatings, each period comprising one layer a high refractive index fluoride material and one layer low refractive index fluoride material, and additionally at least one layer of an amorphous silica material. The silica material can be inserted between each period, inserted between a stack consisting of a plurality of periods, and, optionally, can also be applied as the final layer of the finished element to protect the element.
15 Citations
23 Claims
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1. An element for use in wavelengths less than 200 nm laser systems, said element comprising:
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a substrate, a plurality of periods of fluoride coating materials, each of said periods comprising at least one layer of a high refractive index fluoride material and at least one layer of a low refractive fluoride material, a plurality of layers of an amorphous SiO2 based material selected from the group consisting of amorphous silica, amorphous F-doped SiO2, amorphous N-doped SiO2 and amorphous Al2O3-doped SiO2, wherein one of said layers of amorphous SiO2 is inserted between periods of said fluoride coating materials or between a stack of a plurality said periods, wherein said high refractive index fluoride material has an index in the range of 1.65 to 1.75 and said low refractive fluoride material has an index in the range of 1.35 to 1.45, and wherein the thickness of the amorphous SiO2 layer inserted between the periods of high and low refractive index materials is in the range of 5 nm to 75 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A reflective mirror element for use in wavelengths less than 200 nm laser systems, said element comprising:
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a substrate, a plurality of periods of fluoride coating materials, each of said periods comprising at least one layer of a high refractive index fluoride material and at least one layer of a low refractive fluoride material, a plurality of layers of an amorphous SiO2 based material selected from the group consisting of amorphous silica, amorphous F-doped SiO2, amorphous N-doped SiO2 and amorphous Al2O3-doped SiO2, wherein one of said layers of amorphous SiO2 is inserted between periods of said fluoride coating materials or between a stack of a plurality of said periods, and wherein the thickness of the amorphous SiO2 material between the periods is in the range of 5 nm to 75 nm. - View Dependent Claims (23)
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Specification