Frequency analysis is an interesting alternative to the full transient optical probing due to its relatively simpler frame of investigation. Both frequency analysis and the full transient probing are superior to the steady-state tomography because of more information gathered per measurement point. The study of the systematic response of a semi-transparent slab to a harmonic excitation through a power modulated laser is therefore of interest and is conducted to investigate its optical properties using an accurate algorithm to solve the Radiative Transfer Equation in the frequency domain. It is found that a semi-transparent slab behaves like a low-pass filter for the power modulated light and this behaviour is mainly controlled by the scattering events occurring on the light path (dispersion). The results found are consistent with those in the literature obtained from experiments or simpler analysis models.

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