Abstract
The bouncing configuration of the mirage method has several advantages over the skimming one. Although the signal in this configuration is thought to be due to the variation in refractive index of the surrounding gas alone, it may also be influenced by the thermal expansion of the investigated sample. In this paper, three-dimensional calculations of the deflection of the probe beam from the surface vibrations are presented and the effect of the probe beam's finite size is calculated. Both the transverse and the normal components of the signal are considered. The photodeflection signal obtained is compared with the mirage signal and the effects of various experimental conditions are discussed. The theoretical predictions are compared with experimental data from materials of various thermal diffusivities and thermal expansion coefficients.
Published Version
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