The potassium-mercury lamps and potassium-rubidium lamps made by PGA tubes used to pump Nd3+:YAG lasers were studied experimentally in repetitive frequency operation and were compared with similar xenon flashlamps. In certain range of electrical input power, the overall laser pumping efficiency of a K-Hg lamp is 60% higher than that of the xenon lamp. Some special technological problems were investigated and the orientation for further study of alkali-metal vapor lamps are presented.