The small-signal gain of a cw optically pumped 12-µm NH3 system is investigated as a function of pump intensity, pressure, pump offset, and polarization using a tunable diode laser as a probe. In general, the experiment is found to be in good agreement with calculations based on the theory of two laser fields interacting with a three-level molecular system. Raman gains in excess of 3%/cm are obtained using a waveguide configuration. The significance of these findings is discussed in terms of designing an efficient and powerful cw 12-µm laser.
© 1984 Optical Society of America
C. Rolland, J. Reid, B. K. Garside, H. D. Morrison, and P. E. Jessop, "Investigation of cw optically pumped 12-µm NH3 lasers using a tunable diode laser," Appl. Opt. 23, 87-93 (1984)