Optical grade polycrystalline CVD diamond

Optical grade polycrystalline CVD diamond stock products are available for immediate shipment.

Buy your CVD Diamond products directly from our CVD Diamond buy now page.

CVD Diamonds are also engineered to meet the needs of particular application areas. If you need different CVD diamond shapes, sizes or specifications, please contact us for a quote.

Please call Toll Free 888.558.1504 or email to advanced.materials@ii-vi.com
Our sales department can assist you for any custom order, questions, or special requirements



II-VI Advanced Materials Diamond Thermal Management solutions

10mm x 10mm, 700µm(±50µm)
8mm x 8mm, 500µm(±100µm)
5mm x 5mm, 500µm(±100µm)



25.4mm, 1.2mm(±50µm)
25.4mm, 1mm(±100µm)
8mm, 500µm(±100µm)
10mm, 700µm(±50µm)




All parts ±0.050µm lateral dimensions, Ra < 30nm both sides, edge taper < 3°

CVD Diamond substrates are finished to customer specifications, including:

  • Thickness: tens of µm to over 2mm
  • Surface finish: as-grown, lapped, polished or ultra-polished
  • Surface figure: ultra-flat to slightly convex or concave
  • Optical configuration: plano-plano, wedged, slightly focusing or defocusing.
CVD Diamond can be produced in various material grades, including:
  • Electronic or detector grade
  • Optical grade
  • Thermal management grade
  • Mechanical grade

Term & Conditions

Major CVD Diamonds Applications

  • CO2 Laser Windows(10.6µm)
    - High Power Industrial Leasers
  • High Power Microwave Windows
    - Gyrotrons, Fusion Reactors
    - Radar, Directed Energy Weapons
  • Thermal Management
    - Heat Sinks

Unique Properties

Extreme Hardness Scratch Resistant
Highest Thermal Conductivity Five Times Better Than Copper
Low Thermal Expansion Coefficient Resistant to Thermal Shock
Transparent Over Wide Range Deep UV, Far Infrared, Microwave
Chemically Inert Durable, Biocompatible

Material Properties

Physical Characteristics
Structure cubic, polycrystalline
Grain Size Thickness and process dependent (0.05 - 1mm)
Grades Optical, Thermal, Microwave, Detector, Mechanical, Customer Specific
Thickness* up to 2mm
Fabrication Capabilitiy
Size Laser-cut to customer specification, maximum diameter 145mm
Dimensional Tolerance +/- 50µm
Polishing Aspect Ratio
Up to 50:1 for diameters up to 145mm
Power <0.5 fr/cm
Irregularity <0.5 fr/cm
Transmitted Wavefront <0.5 fr/cm
Surface Roughness <15nm
Thermal Properties (Thermal Grade Materials)
Thermal Conductivity @ 20ºC up to >2,200 (W/mK) at Room Temperature
Special Heat 1 (10-6 K-1)
Linear Expansion Coefficient @ 20ºC 0.536 (J g-1 K-1)
Optical Properties (Optical Grade Materials)*
Bulk Absorption @ 10.6µm <0.07 (cm-1)
Bulk Absorption @ 1um <1 (cm-1)
Scatter @ 1µm <0.7 (cm-1)
Microwave Grade Materials
Microwave Loss Tangent(Tan δ) <2e-5