CVD Single Crystal Diamond Optical Homogeneity via Nitrogen Control
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Solution Overview
Problem
Current materials for optical devices, such as laser windows and etalons, often compromise on multiple required properties like low birefringence, high refractive index, low optical absorption, and high thermal conductivity, limiting their performance due to the inability to simultaneously meet all these criteria.
Innovation Solution
A CVD single crystal diamond material is developed with specific characteristics, including high optical homogeneity, low birefringence, and high thermal conductivity, achieved through controlled nitrogen levels during growth to minimize strain and defects, enabling the material to exhibit a combination of desired optical and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used for optical devices, then one or more requirements may be met, but multiple requirements cannot be simultaneously satisfied, leading to compromised performance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the nitrogen content parameter during CVD diamond growth. By optimizing nitrogen levels (typically 1-100 ppm), the material achieves simultaneous improvement in optical homogeneity, reduced birefringence, and maintained high refractive index, resolving the contradiction between meeting multiple requirements and maintaining reliable performance
Solution Approach 2:
The patent creates a composite material structure by incorporating controlled amounts of nitrogen within the diamond crystal lattice during synthesis. This results in a modified diamond material that combines the inherent properties of diamond with nitrogen-induced improvements in optical uniformity and reduced strain, enabling satisfaction of multiple performance requirements simultaneously
2Manufacturing precision
If high optical homogeneity is achieved, then wavefront distortion is minimized, but manufacturing complexity increases due to precise control requirements
Solution Approach 1:
The patent uses parameter changes by establishing specific nitrogen concentration ranges (1-100 ppm) and controlling growth temperature and pressure parameters. These parameter optimizations enable achieving high optical homogeneity with manageable manufacturing complexity, as the controlled parameter changes follow established CVD process frameworks
3Reliability
If low birefringence is achieved, then optical distortion is reduced, but strain control during growth becomes more difficult
Solution Approach 1:
The patent applies parameter changes by optimizing nitrogen content (1-100 ppm) and growth conditions to control strain during CVD synthesis. This parameter optimization reduces birefringence while maintaining manageable strain control, as the nitrogen-induced lattice modifications follow predictable patterns that can be controlled through process parameters
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 CVD diamond material demonstrates enhanced optical and mechanical properties, such as low optical scatter, high laser damage threshold, and uniform refractive index, making it suitable for high-performance optical applications without compromising on any single parameter.
Implementation Method 1
chemical vapour deposition (CVD) diamond material
Implementation Method 2
controlled low level of nitrogen to control the development of crystal defects
Data Source
AI summary
A CVD single crystal diamond material suitable for use in, or as, an optical device or element. It is suitable for use in a wide range of optical applications such as, for example, optical windows, laser windows, optical reflectors, optical refractors and gratings, and etalons. The CVD diamond material is produced by a CVD method in the presence of a controlled low level of nitrogen to control the development of crystal defects and thus achieve a diamond material having key characteristics for optical applications.