La0.7Sr0.3MnO3 is a strongly correlated complex oxide. There is limited information about La0.7Sr0.3MnO3 thin films’ transient reflectivity (TR), where differences in ultra-fast dynamics due to surface and interface effects are expected. By decreasing the film thickness, additional energy states emerge, providing extra relaxation channels. Due to the reduced absorption in thin films, observing the effects of these extra states in TR signal is challenging, especially in a hole doped system such as La0.7Sr0.3MnO3. Moreover, in lower thicknesses, sinusoidal behavior superimposed on the TR signal is not analyzable by Fourier transforms. Wavelet transforms are perfect tools to analyze these fast-vanishing oscillations.
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