实虚部关联的量子噪声和抽运噪声对单模激光光强关联函数的影响

采用抽运噪声和实虚部之间关联的量子噪声驱动的单模激光损失模型，运用线性化近似方法计算了反映激光动力学性质的光强关联函数C(t)和光强相对涨落C(0)，讨沦了光强关联函数随时间t的演化，分析了量子噪声实虚部间关联系数λq，抽运噪声强度P和量子噪声强度Q对光强关联函数C(t)随时间t演化过程的影响。发现C(t)随时间t的演化是单调衰减过程，但噪声强度的减小和量子噪声实虚部间关联的减弱会使演化曲线整体下移，说明噪声强度和量子噪声实虚部间的关联对C(t)随时间t的演化过程有较大的影响。当时间t增加时，C(t)与量子噪声实虚部间关联系数λq的关系曲线出现了一个极值和三个极值两种不同的情况。最后分析了线性化近似方法适用的条件。

Effects on Intensity Correlation Function by Pump Noise and Quantum Noise with Cross-Correlation Real and Imaginary Parts in a Single-Mode Laser

With the linear approximation method, the intensity correlation function C(t) and normalized mean intensity fluctuation C(0) are calculated, which reflects dynamic properties of the laser. The time evolution of C(t) is discussed in a loss-noise model of single mode laser system by pump noise and quantum noise with cross-correlation real and imaginary parts. The influences on the time evolution of C(t) are analyzed from cross-correlation coefficient between the real and imaginary of quantum noise λq, intensities of the pump noise P and quantum noise Q, respectively. The time evolution of C(t) is a monotonous descending process, while the whole C(t) versus t curve falls down with noises intensity reducing and the cross-correlation between real and imaginary parts of the quantum noise weakening, which shows that the great influence of the noises intensity and the cross-correlation between real and imaginary parts of the quantum noise on the time evolution of C(t). When t increases, an extremum or three extrema appears in the C(t) versus λq curve. Finally, the valid range for the linear approximation method is discussed.