Abstract
The two or multi-mode optically pumped NH3 FIR laser had been studied theoretically. The NH3 molecular gas was assumed to be a three-level system and obeyed the time-dependent behavior of the density matrix equations. Considering the situation of playing the two or multi-mode optical pumping and the FIR laser field were same polarized. The gain coefficient and the output FIR power of the system could be calculated by using the iteration method.
It had been predicted that the two or multiple longitudinal mode optically pumped NH3 FIR laser could have a greater output power or higher lasing efficiency than single mode pumped FIR laser under suitable selected operating parameters of laser.
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Yikun, L., Di, G. Theoretical study of multi-mode optically pumped NH3 FIR laser. Int J Infrared Milli Waves 10, 979–997 (1989). https://doi.org/10.1007/BF01010393
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DOI: https://doi.org/10.1007/BF01010393