Observation of instabilities leading to chaos are reported in the emission from a single mode homogeneously broadened laser. For this system, a short laser cavity NH NH//3 near-resonantly pumped by pulsed CO//2 laser radiation and operating at 12 mu m, it is found that these effects are obtained at a considerably reduced threshold to that predicted for two-level systems and are maintained under steady-state conditions corresponding to long pulse excitation (pulse duration 1300 times the cavity roundtrip time). Observation of such effects over a wide range of conditions for the two emissions studied suggests that this behavior is general for this class of lasers. Dependent on operating conditions, routes to chaos are characterized by period doubling for the single mode system and intermittency, together with evidence of Ruelle-Takens mechanism, for the multimode systems.
|Number of pages||7|
|Journal||IEEE Journal of Quantum Electronics|
|Publication status||Published - Sept 1985|