CVD Diamond:
Quality Control

Quality Control

For quality control, the thermal, optical, dielectric and mechanical properties of diamond disks prepared at the IAF are routinely assessed. 

Thermal conductivity measurements are performed using a laser flash technique. The absorption at 10.6 µm – an important parameter for the application as high-power CO₂ laser window – is analyzed using an IR laser calorimeter. Dielectric losses in the microwave regime are analyzed in cooperation with the Forschungszentrum Karlsruhe. They apply a hemispherical Fabry-Perot resonator for spatially resolved tan d measurements at 145 GHz. Finally the thickness homogeneity, surface flatness and smoothness, phase purity and mechanical strength are analyzed.

Laser flash setup for mapping the thermal conductivity of CVD diamond disks