激光场特定方向上量子噪声实部和虚部之间的耦合效应

COUPLING EFFECT OF REAL AND IMAGINARY PARTS OF QUANTUM NOISE IN A LASER FIELD WITH PARTICULAR DIRECTION

本文用二维气体激光模型对量子噪声的实部和虚部存在耦合的激光场进行了理论分析,利用分离变量法通过福克—普朗克方程导出了振幅在特定方向上的定态激光场强度分布函数的解析式,算出了定态激光强度的平均值,方差和偏斜度,通过计算发现,在特定方向上激光场强度的涨落并不随噪声间的耦合单调变化,它在一定的带宽范围内上下起伏。

The coupling effect of quantum noise terms in a nonlinear laser field is analysed theoretically with a two dimensional gas laser model. By separating the variables, the analytic form of the steady-state distribution function of the laser intensity in a particular direction is derived through, a Fokker-Planck equation. The mean, variance, and skew-ness of the steady-state laser intensity are calculated. It is found that, in the particular direction, the fluctuation of the laser intensity does not change with the coupling of quantum noise monotonusly, it fluctuates in a certain range.