Lorenz-like chaos in NH3-FIR lasers

Abstract Studies of digitized recordings of periodic and chaotic intensity pulsations of an unidirectional far-infrared NH 3 ring laser at 81.5 μm reveal common features (pulsing patterns, dimensions, entropies, and decay rates of the autocorrelation functions) to data sets numerically calculated from the Lorenz equations. The correspondence is striking. Nevertheless, there are small deviations of the experimental data to the numerical data which can, e.g. be explained as relics of counterpropagating waves in the ring laser and as influence of coherence effects from the coherently pumped three-level laser molecule.

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