Pulsed laser fields analog

Analogously to experiment, we thus obtain the nonlinear response of the molecular system resolved in the directions of emission, but summed up over all contributions in each direction. Assuming nonoverlapping laser fields within the RWA, it is moreover possible to separate the PP signals arising from the stimulated Raman and the stimulated emission contribution, respectively. This important feature, which is rather helpful in the interpretation of complex PP spectra (see below), stems from the fact that after the interaction with the pump pulse we may separately consider the electronic ground-state component ( ol (0) or excited-state component ( Ffl f(t)) of the total wave function. 

The analogous quantities for the dissociation laser, Ed(z), ed(o>), and ed(a>) are defined similarly, with the parameters td and cod replacing tx and mx, and so forth. %The pump pulse Ex(t) induces a transition to a linear combination of the eigenstates p of the excited electronic state. The pump pulse may be chosen to encompass any. timber of states. Here we choose the pump pulse sufficiently narrow in frequency to incite only two of these states, E2) and IE3). The dump pulse Erf(r) dissociates the Sfjnolecuie by further exciting it to the continuous part of the spectrum. Both fields are chosen sufficiently weak for perturbation theory to be valid. 

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