Far-infrared CW Raman and laser gain of14NH3

The FIR Raman and laser gain properties of
¹⁴
NH
3
optically pumped by the CO
2
9R(30)
and the N
2
O
10P(13)
laser lines, respectively, have been measured and calculated using the quantum mechanical theory of three-level systems. The laser gain is about two orders of magnitude higher than for usual FIR laser transitions. The Raman gain shows two features characteristic for the two-photon process: extremely high saturation intensity and high pressure maximum. Very satisfactory agreement between theoretically calculated and experimentally measured gain properties is found.