By using Raman-Maxwell-Bloch equations, we have calculated the gain factor and energy conversion efficiency of quasi-stationary stimulated electronic Raman scattering with focused broadband pump laser. The effects of laser pump depletion and saturation of Eaman medium as well as the absorption of the medium to the pump beam are considered in the calculation. The results are agreement with the experimental results of XeCl excimer laser radiation in Ba vapour.