2001 volume 33(5)
doi:10.1068/htwu506

Cite as:
Ivakin E, Makarova L, Rubanov A, 2001, "Optimised method of thermal diffusivity determination of thin films by means of laser-induced dynamic gratings" High Temperatures - High Pressures 33(5) 517 – 524

Optimised method of thermal diffusivity determination of thin films by means of laser-induced dynamic gratings

Eugeny Ivakin, Liudmila Makarova, Alexander Rubanov

Received 20 December 1999

Abstract. The transient thermal grating (TTG) technique in transmitting geometry has been applied to the characterisation of thin-film thermal diffusivity. The thermal grating is initially formed in a film surrounded by two substrates. The theoretical background and present experimental data for diffraction active and nonactive substrates are described. A one-dimensional model of heat diffusion in a three-layer structure fits the experimental data of TTG decay well if the film thickness is less than the thermal grating period. In addition, film thickness, light absorption coefficient in a film, and thermal properties of substrates influence the TTG relaxation time. The optimum experimental conditions have been selected, and the method of thermal diffusivity characterisation of thin films has been devised.

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