Abstract
Based on the level dependence of collision cross sections, a mechanism of light amplification without inversion in a Doppler-broadened three-level system is further studied. In the rate equations, we use a collision-kernel model and consider all of the decay and pumping rates. The emission and absorption profiles are derived by solving the coupled mass-velocity equations numerically. Then, the possibility of obtaining positive gain with noninversion for an ensemble of particles is shown.
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