Dominant wing spectroscopy of energy pooling collisions near the boundary layer involving thermal caesium vapour

We have observed the dominant wing spectroscopy of energy pooling collisionnear the boundary layer involving Cs atoms under the condition of moderate-to-high optical depths at line-centre. It appears from our experimentalinvestigations that the energy-pooling fluorescence presents about16 spectral lines, and all the lines can be assigned to the Cs atomictransitions. We find that all lines of the energy-poolingretrofluorescence from the heated Cs atomic vapour cell show two-peakprofiles. In addition, its pumping power linear dependence in theenergy pooling process has been measured and analysed.