Initial tests on experimental cesium amalgam flashlamps have yielded promising results. These lamps will pump Nd:YAG lasers with efficiencies that are comparable to those of conventional xenon and krypton flashlamps, but with substantially longer lamp life due to the vapor replenishment of the cesium cathode activator.
Harald L. Witting,
"Test results on pulsed cesium amalgam flashlamps for solid state laser pumping", Proc. SPIE 1410, Solid State Lasers II, (1 July 1991); doi: 10.1117/12.43588; https://doi.org/10.1117/12.43588