DEPENDENCE OF THE KINETICS OF THE PHOTON-ECHO ON THE INTENSITY OF PUMPING PULSES

The kinetics of the decay of the photon echo is studied in an SF6 gas and in mixtures of SF6 with Xe and He within the range of intensities of pumping CO2-laser radiation from 0.1 to 10 W/cm(2). With the growth of the intensity of pumping radiation, the relaxation rate was observ ed to increase proportionally to the gas pressure in the initial secti on of the kinetic curve and to slightly decrease for large delay times between the pumping pulses. A difference in the decay kinetics of the advanced and delayed maxima of the notched echo was detected for the first time. The influence of the pumping intensity is especially notic eable in the mixture of SF6 with a heavy Xe buffer and is less pronoun ced in mixtures with He. To account for the experimental results, we p ropose a simplified model where velocity-changing collisions play the main role.