The spectrum evolution of the femtosecond laser pulse in a three-level organic molecular medium(4,4 -bis(dimethylamino) stilbene) is studied theoretically by solving the Maxwell-Bloch equations using an iterative predictorcorrector finite-difference time-domain method.

We study the interaction between the ultra-short laser pulses and the one-dimensional symmetrical π conjugated molecular material (4,4′-bis (dimethylamino) stilbene) by solving Maxwell-Bloch equations.

The effect of time-dependent ionization on two-photon absorption (TPA) cross section of 4,4\'-bis (dimethylamino) stilbene molecules is studied, through solving, the Maxwell-Bloch equations using an iterative predictor-corrector and finite-difference time-domain technique.

To study the evolution of femtosecond(fs) laser pulse in a long-distance two-level medium,the Maxwell-Bloch equations of 5 fs carrier interaeting with two-level medium are numerically solved with use of finite-difference time domain procedure.

The symmetry and covariance of Maxwell equations;

Discussion on dilation transformation and symmetry of Maxwell equations

It is proved in this paper that two divergence equations of Maxwell equations and the normal compo-nents of boundary conditions at stationary media boundaries of time - harmonic fields are not independent.

According to Maxwell equations,the analytical solution of the 4-layered media is derived and the theoretical model is obtained.

The Maxwell equation of Electromagnetic field and the Christoffel equation in the stress analysis were used to get the analytical expression of ultrasonic field of the spiral coil EMAT.