Configurational coordinates model in the alkali-halide exciton laser

A configurational coordinates model in the fully quantum theoretical treatment of the alkali-halide exciton laser is used. The theory predicts a correlation between threshold pumping power and the Stokes shift. The predictions of the theory are compared with the observed characteristics of laser action on the first exciton peak of KBr. The observed spectral narrowing is in good agreement with theoretical prediction.