Two-quantum Amplification of a Short Light Pulse

Janusz Czub, Jan Fiutak, W. Miklaszewski

Eugene Y. C. Lu

V. A. Yurevich

A calculation is reported of the parameters of amplification of light pulses in crystalline laser media with a nonresonant nonlinear polarizability when the duration of the pulses being amplified is less than the phase relaxation time of the medium. A reduction in the contrast and an increase in the frequency of the nutation substructure of the radiation intensity, and also a shift and asymmetry of the Stark doublet structure in the spectrum of the pulses are predicted.

Lawrence L. Hope, Milton O. Vassell

Oleg M. Parshkov, Alexey E. Dmitriev, Andrey L. Vershinin

One consider the amplification of pulses of coherent light in the resonant three-level active media that is excited by short power pulse of coherent light according to the common-upper- level double resonance scheme. The radiation with major frequency (pump) is supposed to be stronger than one with minor frequency (signal). The self-induced transparency is supposed to be established in the pump channel. The exponential growth of stationary shape short signal pulses is studied mainly. One shows that when any described here conditions for initial signal pulse shape are meeting the stationary gained signal pulse of complicated form can be formed. The gains of these pulses are less than ones for signal pulses of quasi-hyperbolic-secant form. Therefore in the case of incomplete condition meeting the competition between the exponentially growing signal pulses with different gains and shapes leads finally to the overwhelming of signal pulse with quasi-hyperbolic-secant-shape form. The effect of inhomogeneous broadening of spectral transition lines on the parameters of signal pulses was studied too. Evaluations that were carried out for any atomic gases show that described in this paper phenomena can be produced at realistic levels of power and duration of pump and signal pulses.

Yangjing Wen, Jian Chen, Xianglin Yang