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A physical model for a flowing four-side pumped alkali vapor laser MOPA system, which considers the saturation effect and amplified spontaneous emission (ASE) and cross-sectional temperature distribution, is established to simulate the output performance of the cesium vapor amplifier. According to the experimental parameters, the simulated result agrees well with the experiment, which demonstrates the validity of this model. Influences of the seed power, the flowing velocity, and the cell length on the amplified power are simulated and analyzed, and a set of optimal operating parameters are obtained. Thus, the model can provide an effective way for designing an efficient side-pumped flowing-gas alkali vapor amplifier.

A new method of pump-coupling in diode-pumped alkali vapor amplifier is reported, which uses ring-LD to tightly surround the alkali vapor cell for directly coupled side-pumping. The kinetic and fluid dynamic modeling, numerical approaches of the ring-LD side-pumped configuration are proposed and applied to the static and the flowing-gas Cs vapor amplifiers. Pump intensity and temperature distribution in the cell are simulated. Influences of some important factors on laser power are calculated and analyzed. Comparisons of different pumped configurations are made, demonstrating the highest utilizing efficiency of pump power of the ring-LD side-pumped configuration. Thus the model is very helpful for designing high-power side-pumped alkali vapor amplifiers.