Calculations on the efficiency of optical pumping of a cesium atomic beam of lasers of finite linewidth

The development of rate equations with coherence in which the effects of laser spectrum wings and linewidth are included is discussed. The optical pumping efficiencies are evaluated in the cesium ground state hyperfine levels when two lasers pumping schemes are used under different conditions of polarization, tuning, laser linewidth, and power densities. It is also found that the effect of coherence is important when one laser is σ polarized in the two-laser optical pumping schemes. Thus it is preferable to avoid σ polarization in order to have a better optical pumping efficiency