Influence of pumping power density on output intensities and stabilities of competitive multi-line frequency up-conversions in cesium vapor

•Varying output intensity ranking of Cs multi- frequency up-conversions is shown.•The nonlinear output intensity growths with the pumping intensity are tested.•The output stabilities increase with the pumping intensity. Multi-line frequency up-conversions are realized in Cs vapor using 718.8nm pumping laser resonating with the two-photon transition 62S1/2→82D5/2 of Cs atom. The pumping beam is converted into a beam including wavelengths of 361.2, 387.7, 455.7 and 621.5nm. Experiments with collimated and focused pumping configurations are carried out and compared. Spectrum peak at 361.2nm is strongest under collimated pumping condition, while 387.7nm is strongest under focused pumping beam. The output beam under focused pumping is more stable than that under collimated pumping. Results in this work may be useful in laser frequency standard, beacon light, laser measuring and optics communications, etc.