Self-pulsing Dynamics of an Optically-pumped CH_3OH 119mum Ring Laser

摘要

Self-pulsing dynamics of an optically-pumped CH_3OH 119 mum ring laser has been observed on the backward emission. As the far infrared cavity frequency was buned close to the crossover of backward and forward output, period one pulsing at a frequency around 2.1 MHz was followed by modulated pulsing due to suppressed forward emission. The ring laser emitted self-pulsing output at around 0.1 MHz with its higher order harmonics under increased operation pressures. A three-level model interacting with a pump and counterpropagating far infrared radiation fields is described to explain the obser vation.