L. Cao

Modulated stochastic multiresonance in a single-mode laser system driven by colored additive and multiplicative noises without external periodic force

The stochastic resonance phenomenon is studied in a single-mode laser system driven by correlated multiplicative and additive colored noises without modulation by external periodic force. We detect that there are multiple extrema (maximum) in the curve of the mean output laser intensity versus the multiplicative noise intensity. This phenomenon called stochastic multiresonance reveals that the mean output laser intensity can be amplified at several values of the multiplicative noise intensity, whose peaks are modulated by a sinusoidal function. This kind of stochastic resonance differs with those reported by past references. Furthermore, similar behaviors also exist in the variance and the skewness.

Effect of the cross-correlation between the real and imaginary parts of quantum noise in the transient properties of single-mode laser

Abstract Different models of single-mode laser were investigated in the situation of cross-correlation between the real and imaginary parts of the quantum noise. It was found that the amplitude equations of different models contain the same novel term. So the amplitude equations of all kinds of models could be written into a general form, which is called as the new amplitude equation. Further we use this new amplitude equation to research specifically the transient properties of white-gain model, the analytical results of the mean, variance, and skewness of first-passage-time (FPT) distributions for the white-gain model are presented, and compared with experimental measurements together with the other two theoretical results. We can conclude that: (1) because of the presence of the novel term containing the cross-correlation coefficient λ q between the real and the imaginary parts of the quantum noise, the expression of mean, variance, and skewness of FPT will change according to different value of λ q ; (2) when λ q =0.15, the agreement between the theoretical curve we obtained with experimental result is more better than the two others. So the new amplitude equation we derived can well describe the transient process of a single-mode laser.