Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Optical and thermo-optical properties of chemical vapor deposited (CVD) diamond

Optische und thermo-optische Eigenschaften von CVD-Diamant

Vincenzini, P.:
Diamond Films. Proceedings of Topical Symposium IV on Diamond Films-Synthesis, Processing and Applications
Faenza: Techna Srl, 1999 (Advances in science and technology 21)
ISBN: 88-86538-22-7
International Symposium on Diamond Films <4, 1998, Florenz>
CIMTEC, World Ceramics Congress & Forum on New Materials <1998, Florenz>
Conference Paper
Fraunhofer IAF ()
CVD diamond; CVD-Diamant; Diamant; diamond; optical properties; optische Eigenschaft; thermal properties; thermische Eigenschaft

Natural diamond is a material with excellent optical and thermo-optical properties, but limited to small sizes. However, the advent of CVD techniques made large area diamond available. For the deposition of CVD diamond windows we have used a novel microwave plasma system with an ellipsoidal reactor, that allows the deposition of high quality CVD diamond on substrates up to 6 in. in diameter. Free standing polished diamond windows were investigated with respect to optical transmission and scattering losses. New techniques have been developed for measuring the thermo- optical properties of CVD diamond. Special care was taken to reduce sample preparation. The IR - absorption coefficient between 9 and 11 mu m has been measured using a novel laser calorimetry setup. By successive thinning the diamond sample, both the local absorption coefficient and the surface absorption were derived. The thermal diffusivity was obtained by applying a new technique, based on electrically induced thermal waves. We found that high quality CVD diamond almost reaches the thermo-optical properties of the best natural diamonds (type IIa).