为了研究激光系统的性质, 采用色抽运噪声和实虚部关联的量子噪声驱动的单模激光损失模型, 用线性化近似方法, 对单模激光系统的输出光强信噪比进行了理论分析; 并具体分析了调制信号振幅、低频调制信号频率、高频载波信号频率、量子噪声强度、抽运噪声强度以及量子噪声实部、虚部间的关联系数对系统随机共振的影响。结果表明, 信噪比随激光系统净增益系数存在随机共振现象。此结果对优化激光动力学提供了理论依据。

In order to study characteristics of a laser system, the signal-to-noise ratio (SNR) of the output laser intensity for a single mode laser was analyzed theoretically by means of linear approximation based on the loss model for a single mode laser driven by the colored pump noise and quantum noise with correlation of the real and imaginary parts. Then, effects of amplitude, low frequency of modulation signal, high frequency of carrier signal, intensity of quantum and pump noise, correlation coefficient of quantum noise between the real and imaginary parts on stochastic resonance of a laser system were analyzed in detail. It is found that the SNR has stochastic resonance phenomenon because of the net gain coefficient of the laser system. The result will provide some theoretical basis to optimize laser dynamics.