VUV Optical Element Fluoride Coatings via Oxide Conversion
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Solution Overview
Problem
Existing optical elements in the VUV wavelength range face degradation due to high radiation intensities, leading to shortened service life, and current methods for improving fluoride layers, such as postfluorination and irradiation with UV light, are ineffective or lead to oxidation, compromising optical performance.
Innovation Solution
A method involving the deposition of an oxide layer followed by conversion into a fluoride or oxyfluoride layer using UV/VUV radiation in the presence of an active fluorination agent, reducing the need for high-temperature aftertreatments and minimizing the use of hazardous gases like F2, while enhancing optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high radiation intensities are used in optical arrangements, then the optical processing capability is improved, but the fluoride layers degrade leading to shortened service life
Solution Approach 1:
The patent applies preliminary action by depositing a protective oxide layer (such as Al2O3, SiO2, or MgO) on the fluoride layer before the optical element is exposed to high radiation intensities. This pre-formed oxide layer acts as a sacrificial protective barrier that prevents radiation-induced degradation of the underlying fluoride layer, thereby extending service life while allowing high radiation intensities to be used for optical processing.
Solution Approach 2:
The oxide layer serves as an intermediary between the high radiation environment and the fluoride layer. It absorbs the harmful effects of VUV radiation and protects the fluoride layer from direct exposure, mediating the interaction between radiation and the optical coating to prevent degradation while maintaining optical performance.
2Reliability
If postfluorination or UV irradiation is applied to improve fluoride layers, then optical performance is enhanced, but oxidation occurs compromising the layer stability
Solution Approach 1:
Instead of applying post-treatment methods (postfluorination or UV irradiation) to the fluoride layer itself, the patent inverts the approach by pre-forming a protective oxide layer on the fluoride surface. This eliminates the need for subsequent treatments that cause oxidation, as the oxide layer is already in its stable, protected state before the optical element is put into service.
Solution Approach 2:
The oxide layer acts as a sacrificial, disposable protective layer that can be easily formed and provides stable protection without requiring complex post-treatment processes. It absorbs the degradation effects, allowing the underlying fluoride layer to maintain its optical performance without undergoing destabilizing postfluorination or irradiation treatments.
3Productivity
If F2 gas is used as fluorination agent, then fluoride layer deposition is effective, but safety infrastructure requirements increase due to corrosivity and toxicity
Solution Approach 1:
The patent extracts the harmful F2 gas from the deposition process by using alternative fluorination agents such as CF4, SF6, or NF3. These substitute gases provide the necessary fluorine for forming protective fluoride or oxyfluoride layers without the extreme corrosivity and toxicity of molecular fluorine, thereby reducing safety infrastructure requirements while maintaining deposition effectiveness.
Solution Approach 2:
The patent uses intermediary compounds (CF4, SF6, NF3) as mediators between the deposition process and the fluoride layer formation. These intermediary gases serve as safer carriers of fluorine atoms, enabling effective fluoride layer deposition without requiring direct use of hazardous F2 gas, thus reducing safety infrastructure needs while maintaining productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method improves optical performance by forming stable fluoride or oxyfluoride layers that resist degradation, extending the service life of optical elements and maintaining high reflectivity in the VUV wavelength range.
Implementation Method 1
converting the oxide layer into the fluoride or oxyfluoride layer by irradiating the oxide layer with UV/VUV radiation in the presence of an active fluorination agent
Implementation Method 2
depositing an oxide layer
Data Source
AI summary
Methods of forming a fluoride or oxyfluoride layer for an optical element for use in the VUV wavelength range, which methods comprise: depositing an oxide layer; and converting the oxide layer into the fluoride or oxyfluoride layer by irradiating the oxide layer with UV/VUV radiation in the presence of an active fluorination agent. An optical arrangement has at least one such optical element. An associated device for forming a fluoride or oxyfluoride layer for an optical element is designed for use in the VUV wavelength range.