Abstract
Laser-induced transient thermal gratings generated on polycrystalline copper and nickel surfaces were measured by photothermal displacement techniques. The goal was to test the potential of this method for determining thermal diffusivities. It is shown that the literature bulk values of the thermal diffusivities are reproduced by a simplified description of the time decay of the grating in terms of a superposition of decoupled lateral and vertical decay rates.
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