Analyses of Valid Range for the Linear Approximation in a Single-mode Laser
单模激光系统线性化近似适用范围的分析

Adopting the linear approximation method, the variance of the intensity is correlated in a loss model of a single mode laser driven by pump noise and quantum noise with cross correlated real and imaginary parts. Moreover, the valid range for the linear approximation method, the influences on the variance of the laser intensity by the intensities of the pump noise and quantum noise, and the cross correlation coefficient between the real and imaginary parts of the quantum noise is discussed respective. The valid range is extended in the case of small noises and far form threshold, and the valid range is the largest in case of small noises, far form threshold , and no correlation between the real and imaginary parts of the quantum noise.