Resonant propagation of femtosecond laser pulse in DBASVP molecule:one-dimensional asymmetric organic molecule

We have investigated the resonant propagation of femtosecond laser pulse in 4-trans-p-(N, N-Di-n-butylamino)-p-stilbenyl vinyl pyridine medium with permanent dipole moments. The electronic structures and parameters for the compound have been calculated by using density functional theory. In the optical regime, there is one charge-transfer state, and the molecule can thus be simplified as a two-level system. Both the one- and two-photon transitions occur between the ground and charge-transfer states. The numerical results show that the permanent dipole moments have an obvious effect on the propagation of the ultrashort pulse laser. The ideal self-induced transparency disappears for 2\pi pulse, and second harmonic spectral components occur significantly due to the two-photon absorption process. For the 6\pi pulse, continuum frequency generation is produced and a shorter duration pulse in time domain with 465 as is obtained.