Abstract-We study the propagation dynamics of a single pair of probe and coupling laser pulses in a three-level cascade atomic medium by numerical solving the Maxwell-Bloch equations for atoms and fields. There are investigated influences of pulse duration, intensity and pulse area of a coupling laser on probe laser propagation. We found the conditions when the undistorted probe pulse in such a medium, i.e., the EIT effect, is established. Under EIT conditions, the ground state population is trapped in a dark state.
Abstract-In this work, we use the generalized nonlinearSchrödinger equation to study the propagation of ultrashort optical pulses in the presence of self-phase modulation, nonlinear absorption and third-order dispersion. The combined effect of the third-order dispersion and nonlinear absorption on amplitude, center location and phase of the soliton has been investigated by an approximate analytical method.
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