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Polycrystalline optical Cvd Diamond Wafer Polycrystalline cvd diamond film for X-ray Optics 10*0.3
Polycrystalline Optical CVD Diamond
Polycrystalline chemical vapor deposition (CVD) diamond is a synthetic diamond material produced by depositing carbon atoms from a gas phase onto a substrate under controlled conditions. Unlike single-crystal diamond, it consists of multiple diamond crystallites with varying orientations, resulting in a polycrystalline structure. This material combines the exceptional optical, thermal, and mechanical properties of diamond with the scalability and versatility of CVD technology, making it a valuable solution for demanding optical applications.
Key Properties
Broadband Transparency: CVD diamond exhibits high transmittance across a wide spectral range, from ultraviolet (UV) to far-infrared (IR), including the visible and mid-IR regions.
High Thermal Conductivity: With the highest known thermal conductivity (~2000 W/m·K), it effectively manages heat in high-power optical systems.
Exceptional Hardness and Durability: It is extremely resistant to abrasion, corrosion, and radiation, ensuring longevity in harsh environments.
Low Thermal Expansion: Its low coefficient of thermal expansion minimizes shape distortion under thermal stress.
High Laser Damage Threshold: Ideal for high-power laser optics, such as windows and lenses.
Manufacturing Process
Polycrystalline CVD diamond is typically grown using microwave plasma-assisted CVD (MPCVD) or hot filament CVD (HFCVD). A carbon-rich gas mixture (e.g., methane and hydrogen) is activated to form a plasma, depositing carbon atoms as diamond on a substrate (e.g., silicon or refractory metals). The polycrystalline structure forms due to nucleation on non-diamond substrates, with grain size increasing with thickness. Post-growth processing, including laser cutting, polishing, and annealing, is employed to achieve the desired optical surface quality and dimensions.
Applications
High-Power Laser Optics: Windows, lenses, and beam combiners for CO₂, fiber, and excimer lasers.
Infrared Optics: Windows and domes for IR imaging and sensing in aerospace and defense.
Synchrotron and X-ray Optics: Beamline components and windows due to high radiation hardness.
Thermal Management: Heat spreaders and sinks for high-power optical devices.
Scientific and Industrial Sensors: Optics for spectroscopy and harsh environment sensing.
Advantages:
Superior optical performance across wavelengths.
Outstanding durability and thermal properties.
Scalable to larger sizes and complex shapes compared to single-crystal diamond.
Limitations:
Light scattering at grain boundaries can reduce transmittance, especially in the UV and visible ranges.
Surface roughness may require advanced polishing for high-precision optics.
Generally higher cost than conventional optical materials like glass or sapphire.
Polycrystalline CVD diamond
polycrystalline CVD (chemical vapour deposition) synthetic diamond products are manufactured by a chemical vapour deposition (CVD) process and are subject to tightly controlled growth conditions during manufacturing and equally stringent quality control procedures.
Polycrystalline optical Cvd Diamond Wafer Polycrystalline cvd diamond film for X-ray Optics 10*0.3
Polycrystalline Optical CVD Diamond
Polycrystalline chemical vapor deposition (CVD) diamond is a synthetic diamond material produced by depositing carbon atoms from a gas phase onto a substrate under controlled conditions. Unlike single-crystal diamond, it consists of multiple diamond crystallites with varying orientations, resulting in a polycrystalline structure. This material combines the exceptional optical, thermal, and mechanical properties of diamond with the scalability and versatility of CVD technology, making it a valuable solution for demanding optical applications.
Key Properties
Broadband Transparency: CVD diamond exhibits high transmittance across a wide spectral range, from ultraviolet (UV) to far-infrared (IR), including the visible and mid-IR regions.
High Thermal Conductivity: With the highest known thermal conductivity (~2000 W/m·K), it effectively manages heat in high-power optical systems.
Exceptional Hardness and Durability: It is extremely resistant to abrasion, corrosion, and radiation, ensuring longevity in harsh environments.
Low Thermal Expansion: Its low coefficient of thermal expansion minimizes shape distortion under thermal stress.
High Laser Damage Threshold: Ideal for high-power laser optics, such as windows and lenses.
Manufacturing Process
Polycrystalline CVD diamond is typically grown using microwave plasma-assisted CVD (MPCVD) or hot filament CVD (HFCVD). A carbon-rich gas mixture (e.g., methane and hydrogen) is activated to form a plasma, depositing carbon atoms as diamond on a substrate (e.g., silicon or refractory metals). The polycrystalline structure forms due to nucleation on non-diamond substrates, with grain size increasing with thickness. Post-growth processing, including laser cutting, polishing, and annealing, is employed to achieve the desired optical surface quality and dimensions.
Applications
High-Power Laser Optics: Windows, lenses, and beam combiners for CO₂, fiber, and excimer lasers.
Infrared Optics: Windows and domes for IR imaging and sensing in aerospace and defense.
Synchrotron and X-ray Optics: Beamline components and windows due to high radiation hardness.
Thermal Management: Heat spreaders and sinks for high-power optical devices.
Scientific and Industrial Sensors: Optics for spectroscopy and harsh environment sensing.
Advantages:
Superior optical performance across wavelengths.
Outstanding durability and thermal properties.
Scalable to larger sizes and complex shapes compared to single-crystal diamond.
Limitations:
Light scattering at grain boundaries can reduce transmittance, especially in the UV and visible ranges.
Surface roughness may require advanced polishing for high-precision optics.
Generally higher cost than conventional optical materials like glass or sapphire.
Polycrystalline CVD diamond
polycrystalline CVD (chemical vapour deposition) synthetic diamond products are manufactured by a chemical vapour deposition (CVD) process and are subject to tightly controlled growth conditions during manufacturing and equally stringent quality control procedures.
