INFLUENCE OF OPTICAL STARK-EFFECT ON AMPL IFICATION OF POWERFUL PULSES IN RESONANCE MEDIA

Amplification of powerful pulses in resonance media is investigated th eoretically with regard to the optical Stark effect and the coherent e ffects. It has been found out that in the course of amplification a pu lse may go through a stage of noncoherent Stark quasisoliton. This sta ge is characterized by an approximately constant and sharply asymmetri c pulse envelope and approximately constant pulse energy. After furthe r amplification the Stark quasisoliton breaks up into a train of short er pulses. At a sufficiently large distance of amplification, a true s oliton can form in the active medium. In the general case, this solito n differs essentially from the standard pi-pulse in media without Star k effect.