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利用三能级系统的密度矩阵方程，通过迭代法计算了小型光泵ＮＨ３分子远红外激光器（ｍｉ－ｎｉ－ＮＨ３－ＯＰＦＩＲＬ）的介质增益Ｇｓ沿激光管的变化规律以及远红外信号光强Ｉｓ沿激光管的放大过程。计算表明激光管有激活区和饱和区，对一定管长的ｍｉｎｉ－ＮＨ３－ＯＰＦＩＲＬ，在一定范围内工作气压的提高，主要使Ｇｓ的峰值增大，同时使激活区缩短，考虑散射损耗和自吸收效应后，Ｇｓ峰值的提高对总的输出光强贡献不大。而泵浦光强Ｉｐ０的增大，有利于激光管内的介质沿光轴方向均匀激活，从而提高总的输出光强。另外，信号频偏对ｍｉｎｉ－ＮＨ３－ＯＰＦＩＲＬ的激光放大过程有较大的影响
By using the density matrix equation of the three-level system, the variation of the medium gain Gs of the mini-optical pump NH3 molecule far-infrared laser (mi-ni-NH3-OPFIRL) along the laser tube and the Is edge of the far- Laser tube amplification process. Calculation shows that the laser tube has an activation region and a saturation region. For mini-NH3-OPFIRL with a certain tube length, the working pressure increases within a certain range, mainly increasing the peak value of Gs and shortening the activation region, taking into account the scattering loss and After the absorption effect, the increase of the peak value of Gs contributes little to the total output light intensity. The pump light intensity Ip0 increases, is conducive to the laser tube medium evenly along the optical axis direction, thereby increasing the total output light intensity. In addition, the signal frequency offset on the mini-NH3-OPFIRL laser amplification process has a greater impact