Resonance radiation trapping effects in CuCl laser

The effects of resonance radiation trapping of 3248 and 3274 Å upon the corresponding laser fluorescent lines of 5106, 5700 and 5782 Å of copper have been investigated as a function of temperature in a CuCl laser with and without helium buffer gas. The experimental values of the laser starting temperature at 315°C and the dissociation level at about 10% in CuCl at resonance radiation trapping threshold are found to be in good agreement with the reported values from calculations.