Abstract
A new technique is presented to study surface absorption properties by utilizing the interaction of a radiatively heated surface region with an acoustic-surface-wave probe. Surface-wave phase changes are induced by the absorption of 10.6-μm laser radiation. A detailed theory is presented to describe the thermal-acoustic interaction under the condition that the laser-induced temperature change is uniform within the acoustic-wave penetration depth. Where the theory is applicable, calculations in which there are no free parameters agree with quantitative phase-change measurements on yx α-quartz and yz lithium niobate. Phase-change dispersion measurements are shown which indicate a sensitivity to the depth dependence of the absorbed radiation and the resulting temperature distribution.
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