Abstract
Ultrafast time-resolved pump–probe studies of energy relaxation and transport in polycrystalline single and multi-layer metal films are presented. The dependence of the surface electron temperature on the film structure was investigated. Vanadium was studied as possible padding layer for increasing the laser damage threshold of metal mirrors. The results, for 300 K < T e<700 K, where T e is the effective electron temperature, show a reduction of the thermoreflectivity signal, Δ R max for the multi-layer structure as compared to the single layer film. This reduction signifies a drop in the surface electron temperature that is in agreement with previous work. Damage experiments, in the high fluence regime, where the thermomodulation data can no longer be related to the effective electron temperature, show that the padding layer does not improve the damage threshold as previously suggested. The experimental results are analyzed within the framework of the two-temperature model (TTM), which agrees well with both thermomodulation and damage results.
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