Abstract
An analysis of the dispersive propagation of surface acoustic waves through a time-dependent thermal gradient induced by radiative absorption is presented. The dispersive phase change of the acoustic wave is shown to depend on the details of the surface absorptive properties of the material. In particular, measurement of such induced phase changes can determine the parameters which characterize the surface depth dependence of the radiarrive absorption coefficient. This analysis is applied to two cases: (i) a strongly absorbing surface layer. The relative sensitivity to bulk and total surface absorption is discussed, as well as the radiative pulse conditions for which the absorption coefficient depth profile can be determined. This technique is applied to published results for 10.6-μm radiative absorption on KCl surfaces for which the total surface layer absorption and the bulk absorption coefficient are individually measured. Additional applicatons to related surface measurements are discussed.
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