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Proceedings Paper

Laser-induced transient gratings application for measurement of thermal conductivity of CVD diamond
Author(s): E. V. Ivakin; A. V. Sukhadolau; Victor G. Ralchenko; A. V. Vlasov
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Paper Abstract

In-plane DII (kII) and normal D⊥ (k⊥) thermal diffusivity (thermal conductivity) of CVD diamond plates have been measured by method of transient gratings and laser flash technique. Samples of insulating and semiconducting boron-doped polycrystalline diamond were synthesized in microwave plasma maintained in methane-hydrogen mixtures. Averaged over the film thickness kII values at room temperature are determined to be in the range of 15-20 W/cmK approaching to those known for single crystal diamonds. From comparison of kII and k⊥ values a thermal anisotropy of 10-20% for in-plane and normal directions (k⊥ > kII) is found, this being ascribed to specific columnar growth of diamond grains. A strong variation (up to 2.7 times) in thermal conductivity across film thickness is revealed for selected specimens using a quasi-surface thermal grating excitation in VUV spectral range. In this case an additional fast-decay diffraction is observed due to nonthermal, owing to generated free charge carriers, recording of the grating.

Paper Details

Date Published: 2 September 2003
PDF: 6 pages
Proc. SPIE 5121, Laser Processing of Advanced Materials and Laser Microtechnologies, (2 September 2003); doi: 10.1117/12.515609
Show Author Affiliations
E. V. Ivakin, Institute of Physics (Belarus)
A. V. Sukhadolau, Institute of Physics (Belarus)
Victor G. Ralchenko, General Physics Institute (Russia)
A. V. Vlasov, General Physics Institute (Russia)

Published in SPIE Proceedings Vol. 5121:
Laser Processing of Advanced Materials and Laser Microtechnologies
Friedrich H. Dausinger; Vitali I. Konov; Vladimir Yu. Baranov; Vladislav Ya. Panchenko, Editor(s)

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