= Polarization-resolved broadband absorption
{title2=$W_x=\pi|d_{21,x}|^2\rho_x(\omega_0)/(\epsilon_0\hbar^2)$}
Weak incoherent frequency components contribute probabilities. The long-time sinc-squared kernel gives the displayed <stimulated absorption> rate for a fixed polarization and spectral energy density per <angular frequency>. Isotropic unpolarized radiation instead contributes $|\mathbf d_{21}|^2/3$. Converting to density per ordinary frequency changes the coefficient by $2\pi$.
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