Correlation of radiation field and the translational motion of atoms in a single-mode laser

The present paper considers a model of a single-mode laser based on two-level atoms having translational degrees of freedom. Correlation of the field and the atomic motion due to the recoil effect is taken into account. The self-consistent theory describing dynamic properties of the system is performed on the basis of semi classical approximation. It is shown that due to the weak friction of resonant atoms in the buffer gas, their translational motion is strongly coupled with the radiation field. The field intensity and the momentum of atoms in the stationary state are calculated. The stationary momentum distribution is obtained and is shown to be far from an equilibrium distribution in the case of weak friction.