INVESTIGATION OF DOUBLE-RESONANCE SELF-INDUCED TRANSPARENCY IN A THREE-LEVEL SYSTEM BY NUMERICAL TECHNIQUES.

The propagation of two ultrashort radiation pulses interacting via an intermediate level is analyzed by numerical integration of a system of equations describing coherent interaction between radiation and a three-level medium. It is found that the propagation of the pulses depends strongly on their ″areas″ on entry to the medium and on the relationship between the dipole moments of transitions between neighboring levels. Substantial temporal narrowing was established for fairly high-power pulses (4 pi and 6 pi pulses) and this may be utilized to control their durations. The influence of relaxation processes, delay of pulses relative to one another on entry to the medium, and nonresonant dispersion during pulse propagation under the specified conditions are also investigated.