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[(a), (c), and (e)] Reflectivity change for , , and superlattice at different pump fluences. [(b), (d). and (f)] The corresponding frequency spectrum calculated by FFT. Part of the spectrum curves are magnified ten times to see the mode clearly. All the curves are vertically translated and labeled with the pump fluence.
Coherent phonon vibration signal for , , and superlattice. The dots are experimental data, and lines are fitted results.
Scattering rate of mode with different pump fluences. The dots are experimental data, and the lines are fitted results.
Comparison of phonon frequencies from Raman scattering and pump-probe experiment
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