ABSTRACT The coherent response accumulation method is used to assess the ability to amplify the polarization rotated component of a probe beam about two-photon resonance cond itions. Atomic gas of alkaline metal atoms is chosen as a medium of interest. Probe wave connects the atomic ground state nS 1/2 with the excited doublet nP 1/2,3/2 , which in its turn is coupled to the higher excited level nS 1/2 by an intense pump field. The relaxation processes and the Doppler effect are also included into the theory. It is shown that sequentially changi ng the input probe fields phase from 0 till and vice-versa, one can get about 2 times narrowing and more than 14 times amplification of intensity for the final part of rotated component of the probe wave. Keywords: pulse amplification, coherent response accu mulation method, narrowing of the pulse 1. INTRODUCTION The usage of coherency in order to manipulate the optical pr operties of atomic or molecular medium is established now as a useful and powerful method