Generation of 16-μm radiation in 14NH3 by two-quantum excitation of the 2ν−2(7,5) state

Abstract
Stimulated emission at 15.82 and 15.91 μm has been obtained in 14NH3 following two‐photon excitation of the 2ν2(7,5) state. Total output energies on the order of 3 mJ have been observed in a simple experimental arrangement. A discussion of the experimental findings concerning the laser output spectrum, the pressure dependence, the utilization of the optical Stark effect, and the influence of the spectral width and spatial profiles of the CO2 radiation providing the nonlinear excitation is given.