Investigation of cw optically pumped 12-μm NH_3 lasers using a tunable diode laser

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Abstract
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.