Diamond Optical Plate
CVD diamond is optically transparent across an almost continuous range from ultraviolet (UV) to terahertz (THz). Uncoated CVD diamond transmittance reaches 71%. The source describes it as having the highest hardness and thermal conductivity of all known materials, along with extremely high wear resistance, chemical inertness and excellent radiation resistance. These combined properties enable applications across X-ray, ultraviolet, infrared and microwave bands.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Growth Method [Optical grade; polycrystalline] | MPCVD |
| Growth Method [Optical grade; single crystal] | MPCVD |
| Dimensions [Optical grade; polycrystalline] | Ф50-Ф150 |
| Dimensions [Optical grade; single crystal; transmission direction] | ≥8@transmission direction |
| Transmittance [Optical grade; polycrystalline; thickness 1mm] | >60%@λ>500nm; >70%@λ>10µm |
| Transmittance [Optical grade; single crystal; thickness 1mm] | >65%@λ>500nm; >71%@λ>10µm |
| Absorption Coefficient [Optical grade; polycrystalline] | <0.12@λ=1.06μm; <0.07@λ=10.6µm |
| Absorption Coefficient [Optical grade; single crystal] | <0.10@λ=1.06μm; <0.05@λ=10.6µm |
| Thermal Conductivity [Optical grade; polycrystalline; 300K] | >1800 W/mK |
| Thermal Conductivity [Optical grade; single crystal; 300K] | >2200 W/mK |
| Coefficient of Thermal Expansion [Optical grade; polycrystalline; 300K] | 1.0 10⁻⁶/K |
| Coefficient of Thermal Expansion [Optical grade; single crystal; 300K] | 1.0 10⁻⁶/K |
| Dielectric Constant [Optical grade; polycrystalline; 140GHz] | 5.5±0.2@140GHz |
| Dielectric Loss [Optical grade; polycrystalline; 140GHz] | <6×10⁻⁵@140GHz |
| Vickers hardness [Optical grade; polycrystalline] | 80 GPa |
| Vickers hardness [Optical grade; single crystal] | 70-120 GPa |
| Thickness [Optical grade; polycrystalline] | ≥1 mm |
| Thickness Tolerance [Optical grade; polycrystalline] | ±0.03 mm |
| Thickness Tolerance [Optical grade; single crystal] | ±0.03 mm |
| Parallelism [Optical grade; polycrystalline] | ≤5 um/cm |
| Parallelism [Optical grade; single crystal] | ≤4 um/cm |
| Flatness PV Value [Optical grade; polycrystalline; 633nm] | ≤1 fringe/cm |
| Flatness PV Value [Optical grade; single crystal; 633nm] | ≤1/3 |
| Roughness Ra [Optical grade; polycrystalline] | ≤10 nm |
| Roughness Ra [Optical grade; single crystal] | ≤2 nm |
Datasheet
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