Miniaturization of pulsed optically pumped CH3OH far infrared laser

A miniature optically pumped CH₃OH FIR laser (CH₃ OH-OH-OPFIRL), which used a pair of metallic meshes as “mirrors” for Fabry-Perot cavity, with variable sample tubes in lengths from 1.0 m to 0.2 m or 0.1 m was constructed. When pumped by a TEA-CO₂ laser 9P(16) line, FIR laser lines of 570 μm, 369 μm and 918 μm wavelength were obtained, and the latter was a new line. By solving the density matrix equations of a quantum system, the output power intensity of the CH₃OH-OPFIRL was calculated by means of an iteration method, and the spectral characteristics were obtained. The relation of the output power intensity versus operating parameters of the FIR laser was studied. A series of FIR emissions of the CH₃OH cavity laser were measured and some peaks were observed by using a scanning F-P interferometer