Interaction of far-infrared and mid-infrared laser transitions in the NH3 laser

Abstract
Laser emission on the conventional 12.8‐μm NH3 laser transition, optically pumped by the CO2 9R16 line, can be completely quenched and replaced by emission at 12.2μm. Cascading far‐infrared laser transitions in the excited ammonia ν2 state are shown to be responsible for the shift in wavelength.