Abstract
The laser, Raman, and hyper-Raman processes are studied in a three-wave four-level system by means of a numerical analysis of the steady-state density matrix equations. Gain spectra curves are presented for IR-IR and IR-MW pumped systems and for two four-level systems in NH <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> that yield 12.159 and 12.114 μm wavelength radiation. Using the gain spectra data, threshold pump intensities, output intensities, ac Stark shifts, <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">M</tex> splittings, optimum NH <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> pressures, and saturation are studied. The theoretical data agrees with the experimental data well within a factor of two. It is shown that the hyper-Raman process can lead to higher power, frequency stable, optically pumped lasers.
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