A bidirectionally emitting ring laser (¹⁵{NH}₃$ at 376-{μ}m wavelength) exhibits self-pulsing and chaos. The routes to chaos are found to be either a one-frequency--period-doubling route to chaos, or a one-frequency--two-frequencies--phase-locking-- period-doubling route to chaos: windows within the chaotic range, the same as reported for a two-roll B\'enard convection cell experiment. In single-mode operation an instability is observed under conditions compatible with the Lorenz model.
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Klische et al. (1985) studied this question.
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