LORENZ CHARACTER OF THE DOPPLER-BROADENED FAR-INFRARED LASER

The dynamic behavior of an optically pumped Doppler-broadened single-mode far-infrared laser is theoretically investigated in detail and compared with that of the simpler Lorenz-Haken laser. Through the analysis of phase diagrams, three-dimensional attractor's projections, intensity maps, and the different terms of the laser equations, the analogies and the differences between the two models are determined. Optical pumping and Doppler broadening, present in this far-infrared laser model, can be approximately incorporated into a Lorenz-Haken model with effective parameters. These results represent a further step toward the understanding of the Lorenz-like behavior observed in recent years in the 81- and 153-mu-m NH3 lasers.