Optics
CVD Diamond Substrates
Enjoy the benefits of diamond's unique properties – very broad transmission range, extraordinary hardness, and high resistance to thermal shock and thermal lensing.
Coherent employs chemical vapor deposition (CVD) to grow optical diamond in high volume, consistently producing material with low scatter, minimal absorption, and low birefringence in a wide range of cross-sectional sizes and thicknesses.
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CVD Diamond Characteristics
Coherent supplies CVD diamond material in sizes up to 145 mm diameter and 2 mm thickness, and can achieve a thermal conductivity of over 2200 W/m-K.
Plasma Chemical Vapor Deposition Diamond Material Properties |
|
Physical Properties |
|
Structure |
Cubic, Polycrystalline |
Grain Size |
Thickness and process dependent (0.05 - 1 mm) |
Grades |
Optical, Thermal, Microwave, Detector, Mechanical, Custom |
Thickness* |
up to 2 mm |
Fabrication Capabilities |
|
Dimensional Tolerance |
±50 μm |
Polishing Aspect Ratio |
Up to 50:1 for diameters up to 145 mm |
Power |
<0.5 fringes/cm |
Irregularity |
<0.5 fringes/cm |
Transmitted Wavefront |
<0.5 fringes/cm |
Surface Roughness |
<15 nm |
Optical Properties |
|
Bulk Absorption @ 10.6 μm |
<0.07 cm-1 |
Bulk Absorption @ 1 um |
<1 cm-1 |
Scatter @ 1 μm |
<0.7 cm-1 |
