Features of the use of the photorefractive method for the local contactless determination of the thermal diffusivity

The main difference between the proposed method and the methods previously used is the modified relative arrangement of the pump and probe beams. Beams which cross in the sample are used. This provides for local measurements along with the possibility of investigating any point in a sample. The main differences between the methods for determining the thermal diffusivity in insulators and in semiconductors are revealed and explained on the basis of an analysis of theoretical and experimental results. Zh. Tekh. Fiz. 68, 115–118 (September 1998)