Study on spectral characteristics and operating parameters of optically pumped NH(3) FIR cavity laser

By solving the density matrix equations of a quantum system and taking into account the multibeam interference characteristics of a Fabry-Perot cavity, the output power density of an optically pumped NH (3) far-infrared (FIR) cavity laser was calculated by means of the iteration method. Based on the calculations, the spectral characteristics and operating parameters of the laser were studied. Experimentally, by using inductive metallic meshes as reflectors and couplers, a series of FIR cavity lasers with a sample tube of 10, 20, and 100 cm in length were designed and constructed, and the emissions of the NH(3) cavity lasers pumped by a TEA-CO(2) laser with a 10R(8) or 9R(16) line were measured. The experimental results were in good agreement with theoretical calculations