原子偶极矩变化行为对激光光场量子统计性质的决定性影响

DECISIVE INFLUENCE OF THE DYNAMIC BEHAVIOR OF THE ATOMIC DIPOLE MOMENT ON THE QUANTUM STATISTICAL PROPERTIES OF LASER FIELD

采用有序化算符技术得到了封闭原子模型激光系统的ＦｏｋｋｅｒＰｌａｎｃｋ方程，通过积分消元方法将其化简为只含场变量的方程，进而求出了激光光场的Ｑ函数．通过对Ｑ函数的分析，发现激光工作能级间的原子偶极矩在稳态值附近的变化行为对激光光场量子统计性质有决定性的影响，并给出了某些条件下这种影响的具体图像．所得结论适用于范围广泛的激光系统，包括无反转激光系统．

Abstract In this paper we derive the Fokker Planck equation of a closed lasing system by using ordering techniques of operators, reduce it to an equation including merely field variables, and then obtain the Q function of the laser field. Through analyzing the Q function, we discover that,at the operating point, the dynamic behavior of the dipole moment between the lasing levels decisively influences the quantum statistical properties of the laser field. Under certain conditions we obtain a clear picture about the influence. The conclusion can be applied to a variety of laser systems, including those without inversion.