Choice of alkali element for DPAL scaling, a numerical study

In this paper, from the efficiency point of view, a systematic comparison of Cesium, Rubidium and Potassium lasers is made. The different properties for the three types of lasers mainly arise from their energy structure, especially the difference of fine-structure energy gap. At a realistic pump intensity of several kW/cm2, the Cesium laser shows a best performance. Some other considerations for choice are also discussed.