Demonstration of self-pulsing instability and transitions to chaos in single-mode and multimode homogeneously broadened Raman laser

Single-mode and multimode self-pulsing instability leading to chaos is reported in the 12.8-{μ}m emission from a homogeneously broadened NH₃ laser, near resonantly pumped by CO₂ laser radiation. Occurrence of instabilities on two independent emitting transitions over a wide range of operating conditions, including those for optimum lasing, indicate that this behavior is general for near resonantly enhanced two-photon Raman systems of this type.