Abstract
The dynamical behavior of two-color ultrashort laser pulse propagating in a molecular medium 4,4'-bis(di-n -butylamino)stilbene (BDBAS) has been studied by employing an iterative predictor-corrector finite-difference time domain (FDTD) tech- nique to solve the Maxwell-Bloch equations. The results indicate that the spectrum of electric field shows oscillation feature around the two-photon resonant frequency when the delay time exists due to the interaction between two sub-pulses. The opti- cal limiting window turns narrower and the saturation value of output intensity gets larger with the presence of delay time compared with no delay time case. The dynam- ical TPA cross section is smaller with the increase of delay time. The studies suggest a method to modulate the nonlinear optical properties of the medium by controlling the delay time of the two-color pulse. PACS: 33.80.-b, 82.50.Pt, 31.15.A-
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