The transient power characteristics of a singly resonant optical parametric oscillator is theoretically described. When analyzing we apply the time delay mathematical model. It is shown that the system demonstrates a variety of regimes with the variation of control parameters.
A time delay (TD) model of difference-frequency generation in a cavity of a dual-wavelength semiconductor disk laser has been derived. By using the model, the steady state operation point, its stability and transient dynamics of an intracavity difference-frequency generator are analyzed. The identical quantities have been also studied with the help of the normal mode expansion (NME) model. Both models result in steadiness of the steady state points for all parameter’s values taken in the simulations. However, the dynamics behaves in rather different manners: the TD model results in the long-lived quasi-periodic relaxation oscillations, while the NME model leads to the fast aperiodic transition to the same steady state point. The time period of the relaxation oscillations equals to the cavity round-trip time.
Steady-state operational characteristics of a dual-wavelength vertical external cavity surface-emitting laser (VECSEL) with a nonlinear quasi-phase-matched crystal placed in the laser cavity have been simulated. We have demonstrated the dramatic effect of three-wave nonlinear optical interaction on the intensity of both fundamental optical fields of the laser. Potential capability of the dual-wavelength VECSEL for efficient generation of midor far-infrared radiation by means of the intracavity nonlinear frequency down-conversion has been shown.
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