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，通过福克-普朗克方程导出了定态激光场强度和位相的分布函数，算出了定态激光强度和位相的平均值，方差和偏斜度。与量子噪声的两个分量为独立随机变量的激光场相比，噪声间的耦合极大地改变了激光场强度和位相的涨落，并引起了激光场强度与位相之间的耦合。

The coupling effect of quantum noise terms in a nonlinear laser field is analysedtheoretically with a two- dimensional gas laser model. The steady- state distribution function of the laser intensity and phase is derived through a Fokker-Planck equation. The mean, variance and skewness of the steady-state laser intensity and phase are calculated. Compared with the laser model of independent noise terms, the coupling of quantum noise terms changes the fluctuations of either intensity or phase drastically, it also introduces coupling fluctuation between the laser intensity and phase.